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Full text of "Geology of the California continental margin : explanation of the California continental margin geologic map series : interpretive methods, symbology, stratigraphic units, and bibliography"

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JLOGY OF THE 
CALIFORNIA CONTINENTAL MARGIN 

EXPLANATION OF THE 

CALIFORNIA CONTINENTAL MARGIN 

GEOLOGIC MAP SERIES 



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BULLETIN 207 



THE RESOURCES AGENCY 

GORDON K VAN VLECK 
SECRETARY FOR RESOURCES 



STATE OF CALIFORNIA 

GEORGE DEUKMEJiAN 
GOVERNOR 



DEPARTMENT OF CONSERVATION 

HANUALL M WARD 
DIRECTOR 




DIVISION OF MINES AND GEOLOGY 

BRIAN E. TUCKER 

ACTING STA TE GEOLOGIST 



BULLETIN 207 

GEOLOGY OF THE 
CALIFORNIA CONTINENTAL MARGIN: 

EXPLANATION OF THE 
CALIFORNIA CONTINENTAL MARGIN 
GEOLOGIC MAP SERIES- 
INTERPRETIVE METHODS 
SYMBOLOGY, STRATIGRAPHIC UNITS, 
AND BIBLIOGRAPHY 

By 

Michael P. Kennedy 

H. Gary Greene* 

and 
Samuel H. Clarke 



1987 



UNIVERSITY OF CALIFORNIA 

MAR 1 ;i 1989 

GOVl. UOCS. - LiukARY 



Prepared in cooperation with 

the U.S. Geological Survey 

and the California Coastal Comnnission 



The project was funded in part by California Coastal Com- 
mission grant CEIP-890-3720-44-1 14-21-01 1; the University 
of Texas, Austin, grant 14-21-0001-301 15; and U.S. Geologi- 
cal Survey, grants 14-08-0001-15858, 14-08-0001-16728 
and 14-08-0001-17694. 



California Department of Conservation 

Division of Mines and Geology 

1416 Ninth Street, Room 1341 

Sacramento, California 95814 



PREFACE 

The California Continental Margin Geologic Map Series and this accompanying bulletin 
have taken five years to complete. This work could not have been done without the assistance 
and encouragement of many enthusiastic and supportive people. The idea of prcxiucing such 
a map series was conceived in 1975 during discussions between the U.S. Geological Survey 
(USGS) and the California Coastal Commission (CCC), while formulating the Geological 
Element to the California Coastal Plan. However, it was not until 1980 that enough data were 
available for work to begin, and at that time the California Department of Conservation's 
Division of Mines and Geology (DMG), with partial funding from the California Coastal 
Commission, initiated the work. Thus, the publications represent the success of a tripartite 
(DMG-CCC-USGS) cooperative effort between state and federal government agencies. 

Geology, like many sciences, is continuously evolving, and maps portraying geologic 
interpretations are thus ephemeral. This map series is no exception. However, it is the first 
standardized offshore geological map series published in the United States, and it does 
represent a foundation for detailed marine geological mapping. Many data voids exist, as 
shown on the maps, and new marine geological and geophysical data are being collected that 
will gradually improve understanding of the geology. Therefore, we foresee the need to 
modify the maps in the future and we hope to upgrade the series with periodic reprinting. 
We profHJse that new map sheets, such as sedimentary isopachs and seafloor resources, be 
added to the series. We welcome any comment about the maps, and are receptive to construc- 
tive criticism. We hope that you find the maps and the method of offshore geology portrayal 
useful. 



iii 



CONTENTS 

Page 

PREFACE iii 

INTRODUCTION 1 

INTERPRETIVE METHODS 2 

Faults 2 

Seafloor Stability 3 

Hydrocorbons 3 

EXPLANATION OF STRATIGRAPHIC TERMINOLOGY AND MAP SYMBOLOGY 4 

Strotigrophic Units 4 

Geologic Contacts 4 

Symbols 4 

COMPOSITE STRATIGRAPHIC SECTIONS 55 

BIBLIOGRAPHY 72 



ILLUSTRATIONS 

Master legend of strotigrophic units 5 

Master explanation of map symbols 6 

Figure 1. Index to California Continentol Margin Geologic Map Series 2 

Figure 2. Location map of profile exomples 8 

Figure 3. Location mop of strotigrophic sections 56 

Plate 1. Master legend and example seismic reflection profile, 

(in color) with symbols and terminology In Pocket 



Example Seismic Reflection Profiles 
with Symbols and Terminology 

1. Geologic contact (buttress unconformity) 9 

2. Geologic contact (ponded sediment) 10 

3. Geologic contact (ponded sediment) 11 

4. Fault (seafloor expression) 12 

5. Fault (seafloor expression) 13 

6. Fault (seafloor expression) 14 

7. Fault (seafloor expression) 15 

8. Fault (Quaternary) 16 

9. Fault (Tertiory) 17 

10. Fault (late Tertiary and Quaternary) 18 

11. Fault (lote Tertiary and Quaternary) 19 

12. Fault (late Tertiary and Quaternary) 20 

13. Fault (late Tertiory and Quaternary) 21 

14. Fault (thrust) 22 

15. Fault zone 23 

16. Faulted anticline 24 

17. Fold (anticline) 25 

18. Fold (anticline, syncllne) 26 



Example Seismic Reflection Profiles 
with Symbols and Terminology (continued) 

19. Structuro! highs and lows 27 

20. Structural high 28 

21. Channel (active) 29 

22. Channel (filled) 30 

23. Channel (filled) 31 

24. Channel (filled) 32 

25. Channel (buried) 33 

26. Channel (buried) 34 

27. Levee 35 

28. Landslide (creep) 36 

29. Landslide (slump) 37 

30. Landslide (slump) 38 

31. Landslide (slump) 39 

32. Landslide (slump) 40 

33. Landslide (slump) 41 

34. Landslide (slump) 42 

35. Landslide (block glide) 43 

36. Landslide (block glide) 44 

37. Landslide (sediment flow) 45 

38. Gas (seep) 46 

39. Gas (bright spot, subsurface) 47 

40. Gas (bright spot, subsurface) 48 

41. Gas (bright spot, subsurface) 49 

42. Diapir 50 

43. Diapir 51 

44. Terrace (constructional) 52 

45. Terrace (erosionol) 53 

46. Terrace (erosionol) 54 



Strotigrophic Sections 



1. Eel River Basin 57 

2. Point Arena Basin 57 

3. Bodega Basin 58 

4. Outer Santo Cruz Basin 58 

5. Northern Monterey Bay Region 59 

6. Southern Monterey Boy Region 59 

7. Offshore Santa Morio Basin 60 

8. Northern Santo Barbara Channel 60 

9. Santa Ynez Unit and Vicinity 61 

10. Dos Cuodros Oilfield and Vicinity 61 

11. Don Miguel Island 62 

12. Santa Roso Island 63 

13. Santa Cruz Island 64 

14. Northeast Coost Santa Cruz Island 65 

15. Offshore Santo Monica Basin 65 

16. Northern Santo Roso - Cortes Ridge 66 

17. Northern Potton Ridge 66 

18. Santa Cruz • Cotalina Ridge 67 

19. Son Pedro Basin 67 

20. Newport Beach - Dona Point Shelf 68 

21. Santa Cotalina Island 68 

22. San Nicolas Island 69 



Stratigraphic Sections (continued) 



23. San Clemente Ridge 69 

24. Southern Gulf of Santa Catalina 69 

25. San Clemente Island 70 

26. San Nicolas Basin 70 

27. Doll Bank 70 

28. Thirtymile Bank 71 

29. Son Diego Shelf 71 

30. Fortymile Bank 71 

31. Centrol Blake Knolls 72 

32. Cortez Bonk 72 

33. Northeast Bank 72 



BULLETIN 207 

GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN: 

EXPLANATION OF THE 

CALIFORNIA CONTINENTAL MARGIN 

GEOLOGIC MAP SERIES - 

INTERPRETIVE METHODS 

SYMBOLOGY, STRATIGRAPHIC UNITS, 

AND BIBLIOGRAPHY 



By 

Michael P. Kennedy', H. Gary Greene', 

and Samuel H. Clarke' 



INTRODUCTION 



This bulletin is a tool for explorationists, planners and 
developers with marine geological, geophysical and seis- 
mological interests in the California continental margin. It 
was developed by the California Department of Conserva- 
tion's Division of Mines and Geology, the U.S. Geological 
Survey and the California Coastal Commission. We have 
presented data primarily in planimetric form on map 
sheets (NOAA/NOS 1:250,000 scale) that cover the area 
from Mexico north to Oregon and from the California 
coastline west to the edge of the continental margin (Fig- 
ure 1). This bulletin is a companion to these map sheets, 
and presents an explanation of the symbols used in illus- 
trations from marine seismic-reflection profiles, represent- 
ative composite stratigraphic columns and a 
comprehensive bibliography of references reviewed or 
used in the compilation of the maps. 

One of the principal purposes of this study was to ac- 
quire and compile all readily available geologic data for 
the California continental margin in a standard format. 
Although considerable geologic data exist for this area, 
heretofore no attempt has been made to compile and 
present it at a common scale with standardized symbolo- 

gy- 

Geologic symbols conventionally used onshore have 
been standardized through years of use. Relatively little 
effort, however, has been made to develop a standard 
format for many geologic conditions that arc unique to the 
offshore. Consequently, marine geologic maps that have 
been produced for offshore arca.s commonly show incon- 
sistencies in symbology that lead to confusion in interpre- 



* Colifornio Department of ConMrvation, Diviiioft of Min«i and Geology 
' U.S. Geological Survey 



tation. We present this bulletin in an effort to standardize 
the symbols needed to illustrate geologic phenomena iden- 
tified by remote sensing techniques in the marine environ- 
ment. We hope that this bulletin will assist marine 
geologists by providing a reference for standard symbols, 
and general users by providing an explanation of symbols 
used. 

Principal sources of the geologic data used in the compi- 
lation of this map series are published, open-file, and pub- 
licly available "in progress" studies. The types of data 
compiled include, where available: 

1. General Geology: Geologic structures (folds and 
faults), bedrock outcrops and (where possible) ages 
and formational names of units, submarine landslides, 
oil and gas seeps, shallow gas-charged zones, and 
areas having unusually high rates of erosion or sedi- 
ment accumulation. 

2. Earthquake epicenter locations superimposed on geo- 
logic structure. 

3. Focal mechanisms for selected earthquakes superim- 
posed on geologic structure. 

4. Regional Bouguer gravity anomalies superimposed on 
geology and magnetic anomalies. 

5. Regional magnetic anomalies superimposed on geol- 
ogy and gravity data. 

6. Geologic hazards (in red). 

7. Sources of data used, oil and gas wells, platforms, and 
ship (racklines of data studied. 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 




Figure 1. Index to Colifornia Confinental Margin Geologic Mop 
Series. Numbers in lower left hand corners of boxes refer to both - 
/metric base sheet used in the compilation. 



INTERPRETIVE METHODS 

Much of the information presented on the maps and in 
this bulletin is ba.sed on the interpretation of subbottom 
seismic-reflection data. These data include high-resolution 
reflection profiles gathered with echo sounder, sparker 
and mechanical pulsing systems, and intermediate to 
deep-penetration profiles gathered with 160 kJ sparker, 
airgun and watergun systems. Subsurface features ranging 
upward in vertical dimension from approximately 1.0 m 
to 1.5 m can be resolved in the higher-resolution records 
that vary in subbottom penetration from 150 m to over 
400 m. The deep-penetration records used to determine 
deep structure can resolve features larger than about 1 5 m 
in vertical dimension and commonly record geologic 
structure at subbottom depths of more than one kilometer. 

Ship positioning was accomplished by range-range pre- 
cision triangulation, augmented in a few remote locations 
by satellite, radar, and incrtial navigation. Location accu- 
racy of the seismic data ranges from ab<iut 15 m with 
precision equipment to ab<iut 500 m where the ship's radar 
alone was used. Although location accuracy was consid- 
ered in the map compilation, areas and data sets using 
different navigation techniques arc not distinguished. 
Therefore, the IcKation accuracy of mapped geologic fea- 
tures varies through each map. The structural notations 
(i.e., well defined, inferred, and questionable) refer to 
confidence of interpretation of geological and geophysical 
data rather than IcKation. 



Standard interpretive methods were used in the analysis 
of seismic-refiection data. For a description of these basic 
methods, the reader is referred to Moore ( 1960) and Pay- 
ton (1977). Additional criteria used to interpret faults, 
seafloor stability and hydrocarbons follow. 

Faults 

Criteria used here for interpretation of faults are based 
on descriptions by Greene and others (1973). Well-de- 
fined faults: ( 1 ) distinct displacement of prominent reflec- 
tors; (2) an abrupt termination of prominent reflectors, or 
the juxtaposition of intervals of prominent reflectors that 
have contrasting acoustic characteristics; or (3) an abrupt 
change in the dips of reflectors across a distinct boundary. 

Inferred faults: (1) small displacement of prominent 
reflectors, in which the upper or shallow reflectors may be 
bent rather than broken; (2) prominent reflectors that are 
discontinuous, and contrasting seismic characteristics that 
are present on either side of an acoustically obscure dis- 
turbed zone; or (3) apparent changes in dip on either side 
of the disturbed zone. 

Questionable faults (mapped where obscure interrup- 
tions of seismic reflectors are present in the subsurface): 
(1) a shift in the phase of reflectors; (2) bent or broken 
reflectors that can be correlated with known faults on 
other lines; (3) termination of weak reflectors; or (4) any 
other zone of seismic contrast, especially where the zone 
appears similar to and is aligned with faults identified on 
adjacent lines. Some questionable and inferred faults have 
been mapped where anomalous tofwgraphic lineaments 
appear to support the continuation of known faults. 

The orientation of faults is determined principally by 
correlation from one seismic line to another. Faults are 
correlated between adjacent lines mainly on the basis of 
their association with similar structural and seismic fea- 
tures on adjacent profiles. Where fault planes dip more 
than about 35°, the vertical exaggeration common to seis- 
mic-reflection records precludes determining the dip, even 
though the records clearly indicate that a fault is present. 
Consequently, faults dipping 35° or more are shown as 
vertical. 

Determining the amount and direction of movement on 
a fault is difficult. Only the apparent vertical component 
(dip separation) of offset can be measured on the seismic- 
reflection profiles; the horizontal comptinent (strike-slip 
separation) can be determined only where piercing points 
of lines representing equivalent geologic features can be 
identified on opposite sides of a fault. Faults that displace 
rocks having similar acoustic characteristics arc common- 
ly difficult to detect on scismic-rcfleclion records. 

The age of most recent faulting as inferred from seismic- 
reflection records is commonly determined from the age 
of the youngest reflector cut by a fault. However, such age 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



assignments may be complicated by several factors so that 
they may not always accurately reflect fault activity. For 
example, active faults in some tectonic settings do not 
penetrate rocks near the earth's surface and are expressed 
instead by folding at shallow depths. Such faults, though 
active, might be interpreted as geologically old fractures 
unless associated seismicity indicates modern activity. 
Similarly, faults that reach the seafloor in Tertiary or 
pre-Tertiary riKks where younger deposits are absent 
might not be identified as geologically youthful unless 
seismicity data indicate otherwise. Furthermore, in many 
areas direct physical evidence of the age of rocks cut by 
a fault is lacking; age a.ssignments in such cases are gener- 
ally rather loosely contrained by similarities in acoustic 
character to rocks of known age in other locations. These 
factors should be btime in mind when using maps derived 
from seismic-reflection data. 

Seafloor Stability 

Criteria used for the interpretation of seafloor stability 
are those described by Clarke and others (1983, 1985). 
Subaqueous landslides mapped are mass movements of 
rigid or semi-consolidated sediment masses along discrete 
shear surfaces, accompanied by relatively little internal 
deformation (Dott, 1963). Landslides are commonly 
identifled on seismic-reflection records by the presence (in 
longitudinal sections) of some or all of the following char- 
acteristics: ( 1 ) a headscarp where the slip surface extends 
upward to and is expressed in the seafloor; (2) compres- 
sional ridges and folded and contorted subbottom reflec- 
tors resulting from small-scale thrusting and folding at the 
toe of the slide; (3) transverse (tensional) cracks in the 
body of the slide; (4) evidence of rotation or limited inter- 
nal deformation of the reflectors; and (5) the presence of 
a slip surface, which may be upwardly concave or planar, 
represented by a discrete failure plane or by an intensely 
deformed zone beneath the slide mass. 

The term slump is commonly applied to a slide that 
shows evidence of rotational movement along a curved 
slip surface, and the term block glide is used for those 
landslides having a relatively planar, usually gently dip- 
ping slide surface. Subaqueous slides may occur on slopes 
of less than one degree and may range in size from simple 
failures covering tens of square meters to composite fail- 
ure zones thousands of square kilometers in area and from 
a few meters to hundreds of meters thick (Mcwre, 1961; 
Heezen and Drake, 1964; Lewis, 1971; Hampton and 
Bouma, 1977). 

Subaqueous mass flows involve the downslope move- 
ment under gravity of water-saturated, unconsolidated 
sediment; the moving mass may behave plastically or as 
a very viscous fluid, and movement may be slow or rapid 
(Dott, 1963). The velocity and displacement of flow char- 
acteristically decrease gradually with depth below the sur- 
face, so that the deposit lacks a distinct slip surface. 
Subaqueous flow deposits are identified on seismic-reflec- 



tion records by (I) the presence of anomalously thick 
sediment masses apparently detached from underlying 
strata, (2) the absence of identifiable slip planes, and (3) 
acoustic transparency or chaotic internal structure. 

Sediment creep in the marine environment is a form of 
flow; it is a poorly understood and poorly documented 
phenomenon. As it is used here, sediment creep refers to 
the slow, more-or-less continuous downslope movement 
of the upper layers of unconsolidated sediment. The oc- 
currence of creep is inferred from seismic-reflection pro- 
files from the presence of hummocky seafloor top<igraphy, 
deformed but identifiable acoustic bedding in the upper 
sediment layers, a downward decrease in the degree of 
deformation, and the apparent absence of a slip surface. 
Creep may extend to subbottom depths of 15-20 m, is 
commonly associated with other types of failure, and may 
affect large areas. 



Hydrocarbons 

Natural gas of biogenic and thermogenic origin may be 
present in marine sediment. Biogenic gas, principally 
methane, is derived from bacterial alteration of organic 
material in sediment. Thermogenic gas, characterized by 
relatively high levels of hydrocarbons heavier than meth- 
ane, is a by-product of petroleum formation. The presence 
of thermogenic gas in sediment can reflect an over-pres- 
surized zone that is discharging gas into the overlying 
strata via a conduit such as a fault or bedding plane. Gas 
of either type present as bubbles in the pore space of 
sediment can increase pore pressure and reduce the shear 
strength of the enclosing sediment, and thus enhance the 
likelihood of failure. Under some circumstances, sediment 
containing dissolved gas can liquefy spontaneously when 
it is subjected to cyclic loading such as may be imposed 
by earthquake shaking (Hall and Ensiminger, 1979) 

Gas accumulation in sediment is suggested on inter- 
mediate- to high-resolution seismic records by ( 1 ) the 
presence of acoustic amplitude anomalies (apparent as 
enhanced or "bright" subbtittom reflectors), (2) the 
sharp termination or displacement of reflectors commonly 
a.ssociated with acoustically turbid zones, (3) the absence 
of surface multiples indicating absorption of the seismic 
signal (Nelson and others, 1978), and (4) the presence of 
"pull-downs," apparent depressions resulting from the de- 
creased velocity of sound in ga.seous sediment and conse- 
quent delayed arrivals of acoustic returns. Water-column 
anomalies on high-resolution seismic records in some 
ca.ses suggest gas bubbles in the water column, although 
other phenomena such as kelp and fish produce similar 
appearing features. Side-scan sonographs and underwater 
video or photographic coverage can show gas seep 
mounds or gas-developed craters on the scaflo<ir. Several 
lines of geophysical evidence are desirable, and sampling 
and gc(Khemical analysis are needed to verify the presence 
of gas and to identify its origin. 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



EXPLANATION OF 
STRATIGRAPHIC TERMINOLOGY 
AND 
MAP SYMBOLOGY 



Each of the seven maps in the Cahfornia continental 
margin geologic map series has a geologic legend and 
explanation that explains the symbols and terminology 
used on that particular map. Here we have presented both 
a legend of stratigraphic units and unit symbols (see 
Master Legend) and an explanation of other map symbols 
(see Master Explanation) that are comprehensive in their 
coverage of the symbols and terminology used in the map 
series. We have also presented examples of interpretive 
line drawings of subbottom profiles (along with the seis- 
mograms on which they are based) to illustrate the use of 
the map symbols in specific geological contexts. 



Stratigraphic Units 

The stratigraphic units used in this study are lithostrati- 
graphic in nature. In most cases, an age or age range is 
assigned to each unit. The descriptions and the age desig- 
nations have been established from fairly widespread core, 
dredge and dart samples offshore and from outcrops, well 
logs and cores in the immediate onshore. The units were 
then correlated across large regions using seismic signal 
characteristics that differ according to inherent rock prop- 
erties. These units can be referred to informally as "acous- 
tic stratigraphic" or, as described in the North American 
Stratigraphic Code (code of stratigraphic nomenclature), 
as instrumentally defined. The ages should be considered 
part of the general description of each unit, and the reader 
should be aware that most are naturally lime transgressive 
or regressive in nature. 

The order in which the units appear is approximately 
youngest to oldest, but this order should not be looked 
upon as superpositional. As the reader will quickly dis- 
cern, many of the units given in the Master Legend are 
local in extent. 



Geologic Contacts 

Geologic contacts shown on the maps are extrapolated 
from a combination of seismic-reflection data, samples, 
and bathymetry, and are approximate in location. Unless 
otherwise specified, the seafloor geology represented on 
the geologic maps is covered with a thin (several meters) 
layer of Quaternary or Holocene sediments. Thus, the 
geologic maps represent seafloor geology as it would ap- 
pear if the thin layer of Quaternary sedimentary cover 
were removed. Where faults offset this thin layer of Qua- 
ternary sediments, the faults are given the age symbol for 
the most recent sediments they cut, even though they are 
shown on the map as existing in an older geologic outcrop 
(for example, faults of Holocene age are mapped in undif- 
ferentiated volcanic and sedimentary rocks of Miocene 
age on the top of Tanner and Cortez bank. 

Symbols 

The symbols used in the offshore (see Master Explana- 
tion and examples 1-46 of subbottom profiles) to denote 
specific geologic features are in part different from those 
traditionally used in onshore geologic mapping. This dif- 
ference stems from the data acquisition methods used in 
offshore versus onshore mapping. 

Most offshore geologic data are collected by remote 
sensing techniques that yield acoustic seismograms like 
those shown with the examples of subbottom profiles. 
Many of the examples in this section are modified from 
Greene and others (1975, 1983) and Yerkes and others 
(1980). Others are selected from data collected and re- 
ported on by Kennedy and Welday ( 1980), Kennedy and 
others (1980), Field and others (1980), Richmond and 
others (1981), and Clarke and others (1983). 

Each example shows a short reproduced section of the 
seismic-reflection profile with an interpretive line drawing 
that empasizes a particular geologic feature. Beneath each 
illustration is the symbol used on the maps and a short 
explanation including the approximate location of the pro- 
file. All features considered to be potential geologic haz- 
ards are shown in red on the geologic maps. Each example 
has a number which is keyed to a location map (Figure 
2). 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



MASTER LEGEND OF 

(T"" Unconsolidated deposits of Quaternary age. 

Qf Fan deposits of Quaternary age. 

Qd Dellaic deposits of Quaternary age. 

Q/Qd Deltaic deposits of Quaternary age overlain by 
thick (greater than .^m) deposits of Q. 

Qcf Canyon or channel fill deposits of Quaternary 

age. 

Qt Unconsolidated marine terrace deposits of prob- 

able Pleistocene age. 

Qp Unconsolidated marine shelf and slope deposits 

of late Pleistocene age. ^^^^- 

Qsp Dcpt»its that may correlate with the San Pedro 

Formation. 

Qar Aromas Red Sands (mostly unconsolidated 

quartzose sand of Pleistocene age). 

Q/Qar Aromas Red Sands (mostly unconsolidated 
quartzose sand of Pleistocene age) overlain by 
thick (greater than 3m) dep<«its of Q. 

QTs Sediment and sedimentary rock of Quaternary 

- • and Tertiary (Pliocene and Miocene) age. 

QTt Terrace deposits of Quaternary and late Tertiary 

(?) age. 

QTpr Unconsolidated sand, gravel, clay and tuff of 

Pliocene and Pleistocene age that may correlate 
with the Paso Robles Formation. 

Q/QTpr Unconsolidated unit of sand, gravel, clay and 
tuff of Pliocene and Pleistocene age that may 
correlate with the Paso Robles Formation, and 
is overlain by thick (greater than .^m) deposits 
of Q. 



STRATIGRAPHIC UNITS 

Tmv Volcanic rock of Miocene ager 

Tmu Volcanic and sedimentary rocks of Miocene age. 

TSC Sania Cruz Mudstonc (siliceous organic mud- 

stone of Miocene age). 

Q/Tsc Santa Cruz Mudstonc (siliceous organic mud- 
stone of Miocene age) overlain by thick (greater 
than }m) deposits of Q 



Tsm Santa Margarita Formation (sandstone and a'r- 

kosic sandstone of Miocene age). 

Q/Tsm Santa Margarita Formation (sandstone and ar- 
kosic sandstone of MitKcne age) overlain by 
thick (greater than 3m) deposits of Q. 



Tp 


Sedimentary rocks of Pliocene age. 


Q/Tp 


Sedimentary rocks of Pliocene age overlain by 
thick (greater than 3m) deposits of Q. 


Tpp 


Purisima Formation (marine sandstone and silt- 
stone of Pliocene age). 


0/Tpp 


Punsima Formation (marine sandstone and silt- 
stonc of Pliocene age) overlain by thick (greater 
than 3m) deposits of Q. 


Tpr 


Sedimentary rock of early Pliocene and late Mi- 
ocene age. 


Tm 


Sedimentary rock of Miocene age 


Q/Tm 


Sedimentary rock of Miocene age overlain by 
thick (greater than 3m) deposits of Q. 



1 



Tmm Monterey Formation (siliceous sandstone, silt- 

stone and mudstone of Miocene age). 

Q/Tmm Monterey Formation (siliceous sandstone, silt- 
stone and mudstonc of MiiKcne age) overlain by 
thick (greater than 3m) deposits of Q. 

Tmp Plutonic and hypabyssal rocks of Miocene age. 

To Sedimentary rock of Oligocenc age. 

Te Sedimentary rock of Eocene age. 

Tep Sedimentary rock of Eocene and Paleocene age. 

Tc Carmelo Formation (sandstone, siltstone, mud- 

stone and cobble-pebble conglomerate of Paleo- 
cene age). 

Ts Sedimentary rock of Tertiary age. 

Tv Volcanic rock of Tertiary age. 

Ku Sedimentary rock of late Cretaceous age. 

Kcs Sedimentary rock of Cretaceous age. 

TMz LinditTcrcntialed igneous nx-k of MuKcnc age 

and mclaniorphic rock of pre-lale Cretaceous 
age. 

Mz Metamorphic rock of pre-late Cretaceous age. 

gr Granitic rock, chiefly diorite, of Mesozoic age. 

gdp Porphyritic granodiorite. 

m Metamorphic rock of unknown age. 

Q/m Metamorphic rock of unknown age overlain by 

thick (greater than 3m) deposits of Q. 

KTc Franciscan Complex, Coastal Belt. 

KJf Franciscan Complex, undirfcrentiated. 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



MASTER LEGEND OF MAP SYMBOLS 



GEOLOGIC CONTACT: Qucned where conuct is uncertain 
Contacts are extrapolated from seismic-reflection data and 
are approximate in location. 



FAULTS: Solid where well defined, dashed where approxi- 
mately located or inferred, quened where uncertain. Thrust 
fault barbs shown on upper plate. Where fault offsets sea- 
floor, age symbol is shown on bar on downthrown side. 
Elsewhere, age symbol is shown astride fault and relative 
offset is shown by "D" and "U" on downthrown and up- 
thrown sides. Ages of faults are indicated as follows: 



D 



T T ' 



■ Cuts strata of Holocene age. 

D Cuts strata of Pleistocene age. 

B Cuts strata of Quaternary age. 

O Cuts strata of late Tertiary and Quaternary age. 

A Cuts strata of Pliocene age. 

A Cuts Miocene or older strata. 

FAULT ZONE 



FOLDS: Solid where well defined, dashed where inferred, que- 
ried where uncertain. Arrow indicates direction of axial 
plunge. 






Anticline 



Syncline 






FAULTED ANTICLINE 



MAJOR STRLCTLRAL FEATURES 




StructuraJ High 




"6 



StructunJ Low 



CHANNELS: 



Active: Dash-dot line marks axis, arrow indicates direc- 
tion of sediment transport 




Filled: Dash-dot line marks axis, arrow indicates direc- 
tion of paleoscdiment transport Channel boundary solid 
where well defined, dashed where inferred, quened where 
uncertain. 



Buried: Dash-do( line marks axis, arrow indicates direc- 
tion of paleoscdiment transport Channel boundary dotted, 
quened where inferred. 



LEVEES: Solid where well defined, dashed where inferred, 
quened where uncertain 




1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



LANDSLIDES: 



Creep (noted on single survey line); Arrow indicates direc- 
tion of sediment movement. 







—i 



Creep (area): Solid where well defined, dashed where in- 
ferred, queried where uncertain. 




.4 TTITUDES: 



X 

Strike and dip of bedding. 
Apparent strike and dip of bedding. 



DIAPIR: Solid where well defined, dashed where inferred, 
queried where uncertain. 




GAS: 



Slump: Solid where well defined, dashed where inferred, 
queried where uncenain. Arrows indicate direction of 
movement. 



^^^...TT^TrTTTTT.. 



■^TTT 



nr. 



Slump scarp: Solid where well defined, dashed where in- 
ferred, queried where uncertain. 



^jrw-irrn-irmt 



-n-?- 



Erosional scarp: Solid where well defined, dashed where 
inferred, queried where uncertain. Generally associated 
with active channels. 



I 

O I 

I 



Block glide: Solid where well defined, dashed where in- 
ferred, queried where uncertain. Arrow indicates direction 
of movement. 




Sediment flow: Solid where well defined, dashed where 
inferred, quened where uncertain. Arrows indicate direc- 
tion of movement. 



i 



Oil and/or gas seep. 



Area of acoustic anomaly (possibly indicating trapped shal- 
low gas) : Solid where well defined, dashed w here inferred, 
queried where uncertain. 



2bnes in which there is a contmuous gas-charged reflector. 
Reflector is generally shallow (30 m) and lies at, or near, 
the base of the unconsolidated Quaternary sediment. 



Zones of discontinuous gas<harged reflectors. Reflectors 
lie within upper Miocene and Pliocene sedimentary rock, 
and within unconsolidated Quaternary sediment. 



Area of shallow subsurface t:ontinuous and discontinuous 
gas accumulation within Quaternary- sediment. Observed on 
05-second high-resolution (Uniboom) seismic reflection 
profiles. 



Discontinuous gas accumulations within late Tertiary- and 
Quaternary sedimentary deptviits Observed along individ- 
ual 2-sccond intermediate-resolution (air gun) seismic-re- 
Hcction profiles. 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 




Figure 2. Location mop for leiimic profile exomplei. 



1986 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



1. GEOLOGIC CONTACT (buttress unconformity) 




1950- - 



KILOMETERS 




1960- 



GEOLOGIC CONTACT: queried where contoct is uncertain. All contoctj are extrapololed 
from seismic-reflection dofo and ore opproximote in locotion. Example from sparker profile 
-? of upper Tertiory and Quaternary (QTs) sediment, ponded in synclinolly folded stroto on 
slope of presumed Miocene (Tm?) sediments. Located in the Gulf of Santo Cotolino west 
of Dono Point, inner southern California continental borderland. 



10 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



2. GEOLOGIC CONTACT (ponded sediment) 



375 



450- 



q: 

u 

I- 

UJ 

2 



525 



600 




08 




l_ 



05 



1.0 
I 



1.5 

—I 



KILOMETERS 



375 



0.5 



450- 



cr 
u 

»- 

UJ 

2 



525- 



600 




GEOLOGIC CONTACT: queried where contact ij uncertoin. All contacts are extrapolated 
from seismic-reflection data and are opproximote in location. Example from Uniboom profile 
of Quoternory (Q) sediment ponded in synclinally folded Miocene (TM) sedimentary rock. 
Located south of San Nicolos Islond, middle southern California continental borderland. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



11 



3. GEOLOGIC CONTACT (ponded sediment) 



638- 



713- 



cc 

LiJ 

u 

2 



TiTTT^TiTTuHflj, 



863 




-0 85 



788- f*- 



1 



05 

L_ 



10 

_J_ 



15 

_l 



KILOMETERS 



-095 



Q 

Z 

O 

u 

UJ 
to 



-1.05 



115 



638 



713- 



hi 

h- 
UJ 

2 



788- 



863 




85 



-0 95 



1/1 
Q 

Z 

o 
u 
liJ 

10 



-1.05 



115 



GEOLOGIC CONTACT: queried where contoci is uncertoin. All contocis ore extropoloted 
from seismic-reflection data ond are approximate in location. Example from Uniboom profile 
of unconsolidated Quaternary (Q) sediment ponded between base of slope and exposed 
bedrock (?) of probable Miocene (TM?) age located in the Gulf of Santa Cotolino, inner 
southern California continental borderland. 



12 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



4. FAULT (seafloor expression) 




1275 





l_ 



_L 



2 



3 
_j 



KILOMETERS 



1125 



to 
q: 

u 

I- 
u 
2 



1200 



1275 




1. 



FAULT: solid where well defined, dashed where inferred, queried where uncertain. Bar and 
age symbol shown on downthrown side of foulf with seafloor expression. Fault displaces 
/ — — seafloor, offsetting acoustically transparent unit (QTs) of presumed late Tertiary and 
Quaternary age. Example from 3.5 kHz profile across inner southern Colifornia continental 
borderland near San Diego. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



13 



5. FAULT (seafloor expression) 



188 



CO 

ct 

u 

UJ 

2 



263 



338 




•025 





l_ 



0.5 

I 



1.0 

_J 



KILOMETERS 



188 



to 

»- 

UJ 

2 



263- 



338 




025 



035 1^0 
Q 

Z 

O 
u 

UJ 
lO 



045 



FAULT: solid where well defined, dashed where inferred, queried where uncertain. Bar and 
age symbol shown on downfhrown side of fault that has seafloor expression. Foult displaces 
seofloor, offsetting sediments of presumed late Tertiary and Quaternary (QTs) age and 

— 9 juxtoposing subjacent units of Miocene (Tm) and possibly Pliocene (Tp?) ages. Also note 

inferred fault within probable Miocene section, ond folded siralo. Example from Uniboom 
profile across Tonner Bank, middle southern California continental borderland (after Greene 
and others, 1975, their Figure 3). 



14 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



6. FAULT (seafloor expression) 




KILOMETERS 



300 



600 



q: 



ui 

2 900 



1200- 




•04 



1. 



.08 



-V2 






I/) 
Q 

Z 

O 

u 

UI 






FAULT: solid where well defined, dashed where inferred, queried where uncertain. Bar and 
age s/mbol shown on downthrown side of fault that has seafloor expression. Fault displaces 
seafloor, offsetting units of late Tertiary amd Quoternory (QTs) age and juxtaposing 
subjacent units of probable Miocene (Tm?) age. Example from sporker profile across 
mainland shelf, inner southern California continental borderland near Oceanside. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



15 



7. FAULT (seafloor expression) 




1800 



KILOMETERS 




150C- 



1800-^ 



FAULT: solid where well defined, dashed where inferred, queried where uncertain. Bar and 
oge symbol shown on downthrown side of foulf that has seafloor expression. Divided box 
indicates youngest strata cut are of Quaternary age. Note that one questionable and four 

— 9 inferred faults cutting Miocene (Tm?) or older strata ore indicated by open triangles astride 

foult symbol. "D" designates downthrown block; "U" designates upthrown block. The»e 
strata are also folded, as shown by anticline and syncline symbols. Exomple from sporker 
profile across Gulf of Sonto Catalina, inner sduthern California continentol borderlond. 



16 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



8. FAULT (Quaternary) 



675- 



K 

Ul 

t- 

^825. 



975- 




•09 



I/) 

Q 

Z 

O 

-11 ^ 

I/) 



• 13 



J_ 



KILOMETERS 



675- 






^825. 



975. 







FAULT: solid where well defined, dashed where inferred, queried where uncertoin. Faults 
designated by divided boxes indicote that strata of late Tertiory and Quaternary age are 
cut. One of these has seofloor expression, indicated by bar ond age symbol on downthrown 
side; another reaches but does not displace seofloor, as indicated by age symbol astride 
fault. "D" designotes downthrown block; "U" designates upthrown block. Example from 
sporker profile within Lome Seo Valley, inner southern California continental borderland. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



17 



9. FAULT (Tertiary) 






i_ 



_L 



KILOMETERS 



450- 



-06 



525- 0- — 



1/1 
a 

t- 

UJ 

2600" 



675- 




FAULT: solid where well defined, doshed where inferred, queried where uncertain. Filled 
triangle (oge symbol) indicates youngest strata cut are Pliocene (Tp) in oge. Folded 

-p Miocene (Tm) sedimentary rock is overlain by Pliocene strato; both lie in fault contact with 

exposed bedrock ridge of folded Miocene strata. Example from sporker profile across 
mainland shelf near Carlsbad, inner southern California continental borderland. 



18 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



10. FAULT (late Tertiary and Quaternary) 




KILOMETERS 




FAULT: solid where well defined, dashed where inferred, queried where uncertain. Divided 
box astride fault symbol indicates fault does not hove seafloor expression ond that youngest 
strata cut are of lote Tertiary and Quaternary (QTs) oge. "D" designates downthrown 

9 block; "U" designates upthrown block. Fault extends to base of "bubble pulse," but 

apparently does not reach the seafloor. Note two unconformities within strata to right of 
foult. Example from sporker profile across inner southern California continentol borderland 
neor Newport Beach. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



19 



11. FAULT (late Tertiarty and Quaternary) 



»y 



035 




KILOMETERS 



263 



•035 




56> 



FAULT: solid where well defined, dashed where inferred, queried where uncertoin. Open 
circle astride fault symbol indicates fault does not have seafloor expression and that 
youngest strata (QTs) cut art late Tertiary and Quaternary in age. Divided box astride 

Q — "p fault symbol indicates thof the strota cut are undifferentiated Quaternary in age. "D" 

designates downthrown block; "U" designates upthrown block. Fault at far left juxtaposes 
late Tertiory and Quaternary (QTs) and older units with an exposed bedrock ridge of 
Miocene (Tm) rock. Example of fault zone from Uniboom profile across San Diego shelf, 
Lomo Sea Valley, and Coronado Bonk, inner southern California continental borderland. 



20 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



12. FAULT (late Tertiary and Quaternary) 




KILOMETERS 




-a— e- 






FAULT: solid where well defined, dashed where inferred, queried where uncertoin. Open 
circles astride foult symbol indicotes faults do not hove seafloor expression and youngest 
strata cut are late Tertlory and Quaternory (QTs) in oge. "D" designates downfhrown 
block; "U" designates upthrown block. Where faults ore close together, they ore sometimes 
mapped as a FAULT ZONE (see Example 15) . Note that fault of left juxtoposes late Tertiary 
and Quaternary strata with on exposed bedrock block of Miocene (Tm) age. Example from 
sparker profile ocross Son Diego shelf, Lomo Sea Volley, and east flank of Coronodo Bonk, 
inner southern California continental borderland. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



21 



13. FAULT (late Tertiary and Quaternary) 



525- 



675- 



a: 
ui 

>- 

bJ 

5 



B25- 



975- 




-07 



-Q9 



>> 



Q 

Z 

o 
u 

UI 
in 



-13 



_1_ 



KILOMETERS 



525- 



675" 



in 

UJ 



825- 



975- 




-07 



-09 



1/) 
O 
z 
o 
u 

UJ 



-13 



FAULT: solid where well defined, dashed where inferred, queried where uncertain. Open 
triangle ostride fault symbol indicates foult does not hove seofloor expression and strata 
cut ore probably Miocene (Tm?) in age. "D" designates downthrown block; "U" designotes 

-p __ upthrown block. Note also the two faults at the for right that are designated by filled box 

and bar on the fault symbol. These hove seofloor expression, and cut strata of presumed 
Holocene oge. Example from sparker profile across Son Diego shelf to Lomo Sea Valley, 
inner southern Colifornia continental borderland. 



22 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



14. FAULT (thrust) 



a/S- 



CO 

UJ 

I- 

UJ 



750- 




1125- 



1 ■' Jv 



'•• • . ' 






.•?.«■ v^ 



-0.5 



C/3 
Q 

z 

o 
o 



-1.0 



-1.5 



2 

_l_ 



4 

J 



KILOMETERS 



375--. 



CO 

(E 
UJ 
H 
UJ 



1125- 




750- 



FAULT (thrust) : solid where well defined, dashed where inferred, queried where uncertain. 

AAA -p Barbs are shown on upper plate. Note thol the youngest stroto cut ore of late Tertiary and 

Quoternory (QTs) age. Example from sparker profile across shelf west of Ventura, middle 
southern California continentol borderland (after Greene and others, 1978, their Plate 1). 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



23 



15. FAULT ZONE 



w 

(E 
UJ 



^ 



250 




500 



750 






W^ij^^ ^v: 









0.6 




^<-- 



1-r- 




•i^-' 



.^.0.4 



0.2 



Q 

Z 

o 
o 

UJ 

w 



0.5 

I 



1 .0 



KILOMETERS 







250 



CO 

cr 

UJ 

h- 
UJ 




500 



750 



QTs 



f^\w\^i 




o.e 



0.8 



10 



^^ ^^ FAULT ZONE: jolid where well defined, dashed where inferred, queried where uncerfoin 

,W^N^^N^^ Fault zone offietj jedimenlory rockj of Miocene (Tm) oge ond locally moy extend to the 
Vv>VV>\\\\\N seafloor. Exomple from the sparker profile across shelf south of San Moteo Point, inner 
southern Colifornio continental borderlond (after Greene and Kennedy, 1981). 



24 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



16. FAULTED ANTICLINE 



C/3 

cr 

I- 

LU 



375 



750 













= -0.5 



CO 

o 
z 
o 
o 

UJ 
CO 



1.0 



1 2 
I I I 

KILOMETERS 



CO 
QC 
LU 

H 375 H 
LU 



750 - 




-0.5 



CO 

D 

Z 

o 
o 

LU 
CO 



- 1.0 



FAULTED ANTICLINE: Gas migrating upward along faults in late Tertiory and Quaternary 
(QTs) strota has accumuloted along the foulted anticlinol crest, increasing the acoustic 
contrast. Example from 2-sec, single-channel oirgun reflection record in offshore Santa Mario 
basin, south central California continental margin. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



25 



17. FOLD (anticline) 



150-r 



0.2 



225- 



UJ 

I- 

1 



300- 



375 






L 



■1-0.5 



0.25 

I 



05 

_J 



KILOMETERS 



150 



225- 



q: 

u 

I- 

UJ 

2 



300- 



375 




0.2 



-0.3 



O 

z 
O 

CO 



-0.4 



0.5 



-? — 






FOLD (anticline): oxis shown os lolid line where well defined, daihed where inferred, 
queried where uncertain. Arrow indicates direction of oxial plunge. Also note small syncline 
to right of anticline, and ongulor unconformity between undifferentiated igneous and sedi- 
mentary rocks of proboble Miocene age (Tmu?) , and overlying stroto of Miocene (Tm) oge. 
Example from Uniboom profile between the Tanner end Cortes Banks, middle southern 
California continentol borderland. 



26 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



375- 



450- 



q: 
lij 

I- 

Ui 

2 



525 



18. FOLD (anticline, syncline) 



-rv : ^).6 



600 




-05 



Q 

Z 

o 

u 

Ixl 

to 



-0 7 



0.8 



KILOMETERS 



375- 



450- 



q: 

u 

I- 



525- 



600 




-? 






FOLD (anticline): axis shown as solid line where well defined, dashed where inferred, 
queried where uncertain. Arrow indicates direction of axial plunge. Also note small syncline 
locoted between the two onticlinol folds, ond the angulor unconformity between folded 
stroto of Miocene (Tm) age and the progradofionol sequence of Miocene (Tm) sedimen- 
tary rocks. Example from Uniboom profile across San Nicolas Island platform, middle 
southern Californiti continental borderland. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



27 



19. STRUCTURAL HIGH AND LOW 




CO 
Q 

z 
o 
o 
m 

CO 







10 

_J 



20 

—I 



KILOMETERS 




2250 



QTs 



gr 






-0 



-1 



-2 



-3 



CO 
Q 

z 
O 

o 

UJ 
CO 






~6 



STRUCTURAL HIGHS AND LOWS: solid where well defined, doshed where inferred. 
Structurol highs formed by the Forallon Ridge (Crefoceous granitic rocks, gr, of the Salinion 
ferrone of Siberling and others, 1984) and the Santo Cruz high (Cretoceous subduction 
melange of Franciscon Complex, KJf ) and the intervening structural low filled by late Terliory 
and Quaternary sediments of the outer Santo Cruz basin. Line drawing from a 4.second, 
single-channel sparker profile run across the continental shelf and slope west of Half Moon 
Bay, offshore centrol Colifornio. 



28 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



20. STRUCTURAL HIGH 



aTS' 



5 






1_ 



I 



KILOMETERS 



375- 



450- 



K 

UJ 

l- 
UJ 

2 



525-^^ 



600- 



675- 




V 



\ 



-05 



-09 




STRUCTURAL HIGH: solid where well defined, dashed where inferred. Top of structural high 
is surface eroded onto presumed sedimentary rocks (Ts) of Tertiary age buried beneoth 
undifferentioled sedimentary rocks and sediments (QTs) of Tertiary and Quaternary age. 
Example from sparker profile across the Gulf of Santo Catalino. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



29 



21. CHANNEL (active) 



300- 



00 600- 
UJ 

I- 

UJ 

2 900- 



1200- 



1500- 




^20 



O 1 
I L 



3 4 
_l L 



KILOMETERS 



300- 



(/)600- 
UJ 



1200- 



1500- 



i 



i 



i 



buried 
channels 



—0.4 




-0 



■20 



Channel (octlve) : da$h-dot line morks chonnel oxij, arrow indicates direction of sediment 
transport. Also note two buried channels beneoth the modern seofloor of presumed Quoter- 
nory-Tertiory, undifferentioted age to right of active channels. Example from sparker profile 
across head of Arguello Canyon, off Point Arguello, central Coiifornia continental margin. 



30 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



22. CHANNEL (filled) 



75- 



2 



150- 



225- 



■HUU 



-01 




to 
Q 

z 
O 
u 

UJ 

if) 



KILOMETERS 



to 

UJ 




to 

Q 

2 

o 
u 

to 



150- : 



225 



5G5fil^^i^ 



CHANNEL (filled): dosh-dot line marks poleochonnel oxis, arrow indicates direction of 
sediment transport. Channel margins indicated by solid line where well defined, doshed 
where inferred, queried where uncertain. Also note fault thot cuts flat lying sediments of 
presumed Holocene age and is expressed in the seafloor. Example from Uniboom profile off 
Point Ano Nuevo, centrol California continental margin. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



31 



23. CHANNEL (filled) 




' ■ ' ! \' 



»■ ■! gill i 




{fPSilin^Tf*^ 





i_ 



25 

I 



050 
I 






(•♦>» 



.0.45 



I/) 
Q 

-0.55 g 

U 
Ul 

10 



-0.65 



KILOMETERS 



338. 



[iJ 413' 

UJ 

1 



488- 




-0.65 



5S5ai^.5©SS 



CHANNEL (filled) : dath-dot line markj poleochannel axis, arrow indicates direction of 
sediment transport. Channel margins indicoted by solid line where well defined, dashed 
where inferred, queried where uncertain. Example from Uniboom profile of upper Tertiary 
and Quaternary (QTs) sediments filling an erosional chonnel locoted off Point Lo Jollo, inner 
southern California continentol borderland. 



32 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



24. CHANNEL (filled) 



637- --ir 



(/5 712- 
q: 

Hi 

u 



787- 



862- 



-085 



rP 




-095 S 

z 
O 



-1.05 



•115 



05 



1.0 



15 



KILOMETERS 



637- 



U) 712- 
UJ 

2 



787- 



862- 




\ ,/ 



-1.15 



•-V 



5fe 



CHANNEL (filled): dash-dot line marks paleochannel axis (not located on profile above), 
arrow indicates direction of sediment transport. Channel margins indicated by solid line 
where well defined, dashed where inferred, queried where uncertain. Note that old channel 
deposits (Qcf) have been incised b/ subsequent erosion, resulting in the formation of a 
modern, active channel. Symbols: QTs, upper Tertiary and Quaternary sediments; Tpp?, 
Pliocene Purisimo (?) Formation. Example from Uniboom profile across Ascension Canyon, 
central Colifornio continental margin. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



33 



25. CHANNEL (buried) 



450 



750- 



i/i 
cr 

UJ 

5 



1050 



1350 






L- 



X 



KILOMETERS 



450- 



750- 




r^^y^A 



y^ 




-0 6 



•10 



-14 



CO 
O 

z 
O 
u 
liJ 



-18 



.\^.\« 



CHANNEL (buried): dash-dot line morkj poleochonnel oxis, orrow indicates direction of 
sediment transport. Channel margins indicated by dotted line. Also note the chonnel ot 
surfoce, above ond to the left of buried channel, filled with undifferentiated sediments of 
lote Tertiary and Quaternary (QTs) age. A modern channel occupying the site of this older, 
filled chonnel may be indicoted by the presence of low-relief erosionol scarps at the surfoce. 
Example from sparker profile across the Gulf of Santo Catolino, off Dono Point, inner 
southern California continental borderland. 



34 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



26. CHANNEL (buried) 



1500- 



101 IIIB iJ 

«i ft exec 



^^^^-^iT^iUt: i-^^^-^' 




KILOMETERS 




1500- 



,V^\ 



CHANNEL (buried): dojh-dot line marks paleochannel axis (not indicated on profile 
above) . Within upper Tertiory and Quaternary (QTs) sediments, the channel margins are 
indicated by dotted lines. Pulled-down reflectors immediately beneath the channel and 
incoherent reflectors at depth probably result from low acoustic velocities ossocioted with 
unconsolidated channel fill materials. Example from sporker profile across the Gulf of Santa 
Catalina, inner southern California continental borderland. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



35 



27. LEVEE 



150- 



450- 



tr 

h- 

LU 



750- 



1050- 



— 55^^ 



- .6 



I ' i ' Tr<''s Tra-Tr i .-ti'.- ' ji [.. ■ gQiy s ■ ■! ! -. vsrr ri KTH s rr z 



--.-3:^ 



;:-t::::ipi 



■T'^' 



11:1 



CO 

Q 

z 
O 
o 

LU 
CO 



- 1.4 



J 



KILOMETERS 



150- 



450- 



1050- 



- .6 





LEVEE: solid where well defined, dashed where inferred, queried where uncerfoin. Levees 
constructed from sediment overflow of active submorine channel (shown os doshdot line 
with orrow indicating direction of sediment transport) . Levees of Quaternary age ore 
deposited upon flat lying strata of sediments and sedimentary rocks of Quaternory and 
Tertiary, undifferentiated, oge (QTs). Example from sparker profile across floor of Gulf of 
Santa Cotolina at base of slope west of Son Mateo Point, southern California continental 
borderland. 



36 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



28. LANDSLIDE (creep) 



563- 



638- 



q: 
u 

I- 

UJ 

2 



713- 




-085 



■075 



O 

z 
O 
u 

UJ 

I/) 



-095 



788- 



i, 



05 







0.5 

l_ 



10 

L_ 



15 
I 



KILOMETERS 



563 



638- 



u 

u 

2 



713- 



788 




075 



-085 



1/5 

Q 

Z 

O 
U 
UJ 
10 



-095 



105 



CREEP (noted on o single survey line) : orrow indicates opparent direction of sediment 
movement in upper Tertiary ond Quoternary (QTs) sediments. Example from Uniboom 
profile off Oceonside, inner southern California continental borderland. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



37 



29. LANDSLIDE (slump) 



563- 



O 

l_ 



_L 



2 
-I I 



-075 




KILOMETERS 



563- 




788- 



075 



-085 



I/) 
O 



k095 uj 



-105 



-9 — 







SLUMP: boundaries solid where well defined, dashed where inferred, queried where uncer- 
tain. Arrows indicate direction of movement. Zone of movement extends to a subbottom 
depth of opproximotely 20 m. Note hummocky seafloor surfoce and back-rotated subbottom 
reflectors (slip surface) . Exomple from Uniboom profile across continentol slope off Crescent 
City, northern California continental margin. 



38 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



30. LANDSLIDE (slump) 



375' 




KILOMETERS 



375' 





SLUMP: boundaries solid where well defined, dashed where inferred, queried where uncer- 
tain. Arrows indicate direction of movement. Zone of movement extends to a subbottom 
depth of 30 m. Note hummocky seafloor surface, slip surfoces and bock rotation of reflectors 
within moving sediment moss. Exomple from Uniboom profile across slope west-northwest 
of Crescent City, northern California continental morgin (after Field and others, 1980, their 
Figure 15) . 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



39 



31. LANDSLIDE (slump) 



-0.35 




KILOMETERS 




-035 



-045 



563 



— '?— ^ 




-055 



-065 



075 



SLUMP: boundaries solid where well defined, doshed where inferred, queried where uncer- 
tain. Arrows indicate direction of movement. Zone of movement extends to o subbottom 
depth of in excess of 100 m involving sediments of late Tertiory and Quaternary (QTs) age. 
Note slip surfaces and apparent drag folding of strato adjacent to slip surfoces. Example 
from Uniboom profile neor La Jolla Conyon, inner southern California continental border- 
land. 



40 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



32. LANDSLIDE (slump) 



150- 



225- 



liJ 

2 



300- 



375- 



T-02 




KILOMETERS 



150-r 



225- 



a: 

UJ 

1 



300- 



375 





SLUMP: boundaries solid where well defined, dashed where inferred, queried where uncer- 
tain. Arrows indicate direction of movement. Zone of movement extends to a subbottom 
depth of approximately 90 m in sediments of late Tertiary and Quoternory (QTs) age. Note 
apparent slip surfaces and bock-rotated reflectors. Exomple from Uniboom profile across 
Ascension Canyon, central California continental margin. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



41 



33. LANDSLIDE (slump) 



0-' r—l >- 



80- 



« 100- 



150- 



200- 



T ^r,^;. ,■•/•. i■"y^^l^^;^-;i^^;:*•^ t i'i^j. if -r I -iin'-T^!;" jV"'' i.T-ri; ..■"*";'" "° 



^^^^ ■'■■'"■!;' -iCiii'^i?!' ;';•;;; "li 




-005 



(A 

-0 10 o 

O 
<j 



-0 15 



-0.20 



0.5 

_J 



1 



1.5 

-I 



KILOMETERS 



— 



50- 



100- 



150- 



200- 




— 9 . 







SLUMP: boundaries solid where well defined, dashed where inferred, queried where un- 
certain. Arrows indicate apparent direction of movement in deposits of late Tertiary and 
Quoternory (QTs) age. Movement of the slump mass along a generally arcuate failure 
surface has destroyed the bedding and produced o nonreflecling zone. Example from 
Uniboom profile across the continentol slope off outer Santa Cruz bosin, central Californio 
continental margin. 



42 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



34. LANDSLIDE (scarps) 



375 



1-05 




675 



1 2 
I I 1 I 1 

KILOMETERS 



375 



450- 



q: 



t^525- 



600- : 



675 




^^rmrrmrr.- 



■^TTT; 



SCARPS: boundoriej solid where well defined, doshed where inferred, queried where 
uncerfoin. Hochures indicote slump scorp. Zone of movement involves sediment of late 
Tertiory and Quaternary (QTs) oge. Note double hochures indicate erosionol scarps. 
Example from Uniboom profile ocross La Jolla Canyon, inner southern Colifornio contlnentol 
borderland. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



43 



35. LANDSLIDE (block glide) 



450-1 



750- ; 



I/) 
q: 

UJ 
Ul 



1050- 



1350- 




-0.6 



KILOMETERS 



450- 



750- 



I/) 
a: 

UJ 

h- 
UJ 



l<3- 



QTs 



1-06 



QTs 



1050- 




Tm? 



1350- 



•10 



1/1 
Q 

z 
O 
u 

Ul 



.14 



-?--! 



BLOCK GLIDE: boundaries solid where well defined, dashed where inferred, queried where 
uncertain. Arrows indicate opporenf direction of movement Zone of movement extends to 
a subbotfom depth of 150- 190 m, involving sediments of late Tertiary and Quaternory 
(QTs) age. Note relative acoustic transparency of blocks, possibly the result of intense 
deformation of strata within the blocks. Erosional channels may develop locally along 
pull-apart fractures between blocks, shown by double hachures (erosional scorp) . Example 
from sparker profile across base of slope off Newport Beach, inner southern California 
continental borderland (after Greene and others, 1983, their Figure 2-10). 



44 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



36. LANDSLIDE (block glide) 



























i 

1 








































Af^Ci^ 


^ 


k 


































Mm 






























"06 












M 




























■ 






!! 


^ 








AL 
















'JiL 




M 


. 1 


V.vt 




















'^i/i ■•- 










10 525" 

01 


•^/?k*»«^. . 


t 




■07 


LiJ 

1- 
iii 




■lk->..^^ 


r 


mmsrsf 




z 








W 


: "'! 


t::. . -"m^'M. r^. %^^ 












"^ 






^^^ 


n|Hi 


-ym-i^ 


-9 




f^r\r\^ 
















•'-^ 


' / 


k 


' ' 






\^ 
























s 


























k 










*l^ 


■ 
































i^'f 




































•* 













































































L_ 



KILOMETERS 



600- 



675- 



-06 




-0 9 



■-?--! 



BLOCK GLIDE: boundaries solid where well defined, doshed where inferred, queried where 
uncertain. Arrows indicate apparent direction of movement. Zone of movement extends to 
a subbottom depth of approximately 90-100 m, involving sediments of late Tertiary and 
Quaternary (QTs) age. Note that internal deformation of blocks is greatest toward the front 
edge (downslope), and sole (base) of the mass. Locally, erosional channels may develop 
along pull-opart fractures between the blocks. These ore shown with double hochures 
(erosional scarp) . Example from mini-sparker profile across slope south of Newport Beach, 
inner southern Colifornio continental borderland. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



45 



37. LANDSLIDE (sediment flow) 



225- 




w 

liJ 

I- 
liJ 

2 



300- 



375- 



•■} ',; 



T- frfTfr* I ■ ■: ■ ; ' ■ . I ' ! ■ '!■ ! 'A ' ■ ■• :; ■ , ( iv 
. • 1» ir .?.' -^ ..'. :v : ■. I ;• •!. r' 't ■ ' . 



I -(5 






0.3 









0.5 



1.0 

—I 



KILOMETERS 



225- 



LLI 

2 



300- 



375- 



1. •.■ .■•.•■i'.'-'-v ■..■•.: ■;•••>■•. 



..rV^;.r>->.x^.v.-' 










-0.5 



•i."i»!K:-';) 



SEDIMENT FLOW: Boundaries solid where well defined, dashed where inferred, queried 
where uncertain. Arrows indicate direction of movement in sediments of lofe Tertiory ond 
Quaternary (QTs) age. Note multiple headscarps obove thick, detached sediment moss, 
acoustic transparency of this mass, and absence of an identifiable slip surfoce. Example from 
Uniboom profile across north slope of Santo Barbara Channel, (approximately 35 km) west 
of Santo Borboro (from Edwards, 1982). 



46 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



38. GAS (seep) 



375 



450- 



q: 

UJ 

I- 

UJ 

I. 



525- 



600 




T^O.5 



-0.6 



I/) 
Q 
z 
O 
u 
u 



-.-O? 







0.5 

I 



10 



1.5 

_i 



KILOMETERS 



08 



375 



450- 



q: 

u 

t- 

UJ 

2 



525- 



600 




0.5 



-0.6 



z 
O 
u 



-07 



08 



I 



OIL AND/OR GAS SEEP: symbol indicates presence of subbotfom ond water column 
ocoustic anomalies associated with gas seeps. Gas seep occurs in sediments of late Tertiory 
ond Quaternary (QTs) oge. Queried where uncertain. Example from Uniboom profile across 
base of slope off Point La Jolla, inner southern California continental borderlond (after 
Greene ond others, 1983, their Figure 2-16). 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



47 



39. GAS (bright spot, subsurface) 



75- 






150 



225 




KILOMETERS 




225 



GAS: area of acouttic anomaly, possibly indicating the presence of gas-saturated sedi- 
ments. Solid where well defined, dashed where inferred, queried where uncertain. Acoustic 
anomalies above occur in flat-lying Quaternary (Q) sediment overlying an eroded, flat- 
topped, Miocene (Tm) bedrock ridge. Exomple from Uniboom profile across San Pedro 
escarpment and shelf, middle southern California continentol borderland. 



48 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



40. GAS (bright spot, subsurface) 



150 



10 
K 
(iJ 

I- 
lU 




225- 



300 




I 



Jte04 



KILOMETERS 



150- 



UJ 

I- 
2 




O 

z 
O 
u 

UJ 



225- 



300 



GAS: area of acoustic anomaly, possibly indicating the presence of gos-saturoted sediment. 
Solid where well defined, dashed where inferred, queried where uncertoin. Example from 
Uniboom profile across shelf and upper slope west of Crescent City, northern California 
continental margin. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



49 



41. GAS (bright spot, subsurface) 






i_ 



_i_ 



KILOMETERS 




GAS: area of acoustic anomaly, possibly indicating the presence of gas saturated sediment. 
Solid where well defined, dashed where inferred, queried where uncertain. Example from 
3.5 kHz profile across shelf off Crescent City, northern California continental margin. 



so 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



42. DIAPIRIC RIDGE 



250 



033 




KILOMETERS 



250 



33 





-?— . 






DIAPIRIC RIDGE: Solid where well defined, doshed where inferred, queried where uncertain. 
Shale-cored diapir pierces upper Tertiary and Quoternary (QTs) strata ond extends above 
the seafloor. Example from 3.5 kHz profile across marginal plateau west-northwest of Eureka, 
northern Colifornio continental margin. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



51 



43. DIAPIRIC RIDGE 




1500 







4 

_l 



KILOMETERS 



300- 



600- 



q: 

UJ 

^ 900H 



1200- 



1500- 





DIAPIRIC RIDGE: Solid where well defined, dashed where inferred, queried where uncertoin. 
Shole-cored diopir pierces upper Tertiary and Quaternary (QTs) and older strata ond 
extends obove the seafloor. Example from sporker profile across morginol plateau west- 
northwest of Eureka, northern California continental margin. 



52 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



44. TERRACE (constructional) 



I' p rr»pm:' i i ^)a!.m : ;y:;t- ;- ; ■ ly-r '■.^■'jri ~ ^m9^»' ^f.l m^f n ■:"'^Ffr'Wf^^^ •'■' 



75- 



I 



•9!ra 



1 



v> 

Ul 



•-150- -= 



225 



3O0- 







05 

I 



10 



KILOMETERS 



75- 



q: 
ui 



^-150- 



225- 



3O0- 




-01 



■04 



TERRACE (constructional) : Example from Uniboom profile across east flank of Cortes Bonit, 
middle southern Colifornio continentol borderland, showing Pleistocene (QT) progrodotion- 
al terroce sequences forming a constructional or depositional marine terrace (after Greene 
and others, 1975, their Figure 5). 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



53 



45. TERRACE (erosional) 




KILOMETERS 



75- 



1/1 



tu 

2 



225" 



300" 



acousticolly tronsporent unit 



angular unconformity 




-01 



I-02S 

z 
O 

(/) 



-03 



-04 



TERRACE (erosional): Example from Uniboom profile ocross shelf off Point La Jolla, inner 
southern Colifornio continental borderland. Undifferentiated, folded Cretaceous strota (Ku) 
ond overlying upper Tertiary and Quoternary (QTs) progradotionol sequence hove been 
bevelled by wave action. Acoustically Ironsporonf unit overlying wove-cut platform is proba 
biy Holocene (Q) in age. 



54 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



46. TERRACE (erosional) 



150 




-0.1 



00 
Q 

Z 

O 
u 



_. L 



KILOMETERS 



75- 

CO 

cc 

UJ 

\- 

LlI 

150- 




-0.1 



00 
Q 

Z 

O 
u 

Ld 

00 



•0 2 



TERRACE (erosionol): Wove-ploned, platform composed of undifferentioted, folded Crefo- 
ceoui (Ku) strato, forming o wove-cul terrace, partially overlain by acoustically transporont 
layer of Holocene (Q) age. Example from Uniboom profile across shelf off Point La Jolla, 
inner southern California continental borderland (ofter Greene and others, 1983, their 
Figure 2-18). 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



55 



COMPOSITE STRATIGRAPHIC SECTIONS 

The stratigraphic columns are composite, generalized 
sections developed by compiling and modifying onshore 
and offshore data from Greene and Clark ( 1*)79), Hoskins 
andGrifTiths (1971), Howell and others (1978), McCul- 
loch and others (1982. 1985), Vedder and others ( 1974, 
1976, 1980), and Clarke (1987), as well as from unpub- 
lished sources. 

Each of the columns shows the generalized geology for 
the area in which it is located. Each section has a number 
that is keyed to a location map (Figure 3). The reader 
should not attempt to correlate the stratigraphic units 
from the columns to the maps because the maps are con- 
structed primarily from acoustic stratigraphic units and 
the columns represent rock stratigraphic units exclusively. 
Rock stratigraphic names are tentatively correlated to 
acoustic units on the geologic legends only where dredge 
and core data support their use. The thickness of geologic 
units shown on the columns is approximate and was 
derived, where available, from seismic velocities, well logs, 
and onshore geologic maps. 

The reader should note that the diagramatic strati- 
graphic columns from Hoskins and Griffiths (1971) in- 
cluded in the text are not individual well sections, but are 
composite representative sections for entire offshore ba- 
sins, and that the indicated thicknesses are the interval 
maximum for the entire basin. 



Figure 3 
Areas 

1. Eel River Bosin I 

2. Point Areno Bojin B 

3. Bodega Bosin B 

4. Outer Santo Cruz Basin B 

5. N. Monterey Bay Region A 

6. S. Monterey Boy Region A 

7. OHshore Santo Mario Bosin B 

8. N. Santo Borboro Chonnel E 

(OCSCAL 78164 No. 1) 

9. Santo Ynez Unit and vicinity C,G 

10. Dos Cuadros oilfield and vicinity G,H 

11. Son Miguel Island F 

12. Sonto Rosa Island F 

13. Sonfa Crui Island F 

14. N.E. Coast Santo Cruz Island C,G 

15. OHshore Santo Monica Bosin C,G 

16. N. Santo Roso - Cortes Ridge C,G 

17. Northern Potion Ridge C,G 

18. Sonto Cruz • Catolino Rid0« C,G 

19. Son Pedro Bosin C,G 

20. Newport Beach Dona Pf. SheK C,G 

21. Sonto Cotolino Island F 

22. Son Nicolas Island F 

23. Son Clemente Ridge C,G 

24. S. Gulf of Sonto Catolino C,G 

25. Son Clemente Island G 



26. Son Nicolas Basin C,G 

27. Doll Bonk C,G 

28. Thirtymile Bonk C,G 

29. Son Diego Shelf C,G 

30. Fortymile Bank C,G 

31. Centrol Bloke Knolls C,G 

32. Cortes Bonk C,G 

(OCSCAL 75-70 No. 1) 

33. Northeast Bonk C,G 



Figure 3 
References 

A. — Greene, H.G., ond Clork, J.C, 1979, Neogene poleogeogro- 
phy of the Monterey Boy oreo, California, In Armentrout, J., 
Cole, M.R., ond Terbest, H., editors, Cenozoic poleogeogro- 
phy of the western United States, Pacific Section Society of 
Economic Paleontologists ond Mineralogists, Pacific Coost 
Poleogeogrophy Symposium 3, p. 277-296. 

B. — Hoskins, E.G., and Griffiths, J.R., 1971, Hydrocorbon potential 
of northern and central Colifornio offshore; Future petroleum 
provinces of the United Stotes — their geology and potentiol: 
Americon Association of Petroleum Geologists Memoir 15, p. 
212-228. 

C— Howell, D.G., McCulloch, D.S., and Vedder, J.G., 1978, Gen- 
eral geology, petroleum opproisol, ond nature of environmen- 
tal hazards, eostern Pacific shelf latitude 28 degrees to 38 
degrees north: U.S. Geological Survey Circulor 786, 29 p. 

D.— McCulloch, D.S., Clorke, S.H., Jr., Dolton, G.L., Field, M.E., 
Scott, E.W., ond Utter, P. A., 1982, Geology, environmentol 
hozords ond petroleum resources for 1982 OCS lease sole 73, 
offshore centrol and northern Colifornio: U.S. Geological Sur- 
vey Open-File Report 82-1000, 77 p. 

E. — McCulloch, D.S., Utter, PA., and Menock, J., 1985, Mops 
showing location of selected pre-Quaternory rock somples 
from 34°30" N latitude to 42° N lotitude, Colifornio continen- 
tal margin: U.S. Geological Survey Miscellaneous Field Inves- 
tigation Mop, MF 1719 (in press). 

F. — Vedder, J.G., Beyer, L.A., Junger, A., Moore, C.W., Roberts, 
A.E., Toylor, J.C, ond Wogner, H.C., 1974, Preliminory report 
on the geology of the continentol borderland of southern 
California: U.S. Geologicol Survey Miscellaneous Field Stud- 
ies Mop FM-624, 34 p., 9 sheets, scale 1:500,000. 

G.— Vedder, J.G., Greene, H.G., Scott, E.W., and Taylor, J.C, 
1976, A summory report of the regional geology, petroleum 
potential, environmental geology ond technology for exploro- 
tion and development in the area of proposed lease sole 48, 
California continental borderlond: U.S. Geological Survey 
Open-File Report 76-787. 

H. — Vedder, J.G., Crouch, J.K., Scott, E.W., Greene, H.G., Cromer, 
D., Ibrahim, M., Tudor, D., and Vinning, G., 1980, A summary 
report of the regional geology, petroleum potential, environ- 
mentol geology, and operotionol considerations in the oreo 
of proposed leose No. 68, offshore southern Colifornio: US 
Geological Survey Open-File Report 80- 198, 62 p. 

I. — Clorke, S.H., 1987, Geology of the Colifornio continentol morgin 
north of Cope Mendocino, in Scholl, D.W., Grontz. A,, and 
Vedder, J G., editors. Geology and resource potential of the 
continentol morgin of western North America and adjocent 
oceon basins — Beaufort Seo to Boja California: Circum Pa- 
cific Council for Energy and Mineral Resources, Earth Science 
Series (in press) . 



56 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



124° 




120° 


116° 


1 




1 


1 


5 




~ — 1 


;.''- ( 




1 




' . - ■> A 




1 




:\ i ) 




1 

i 








1 

1 




rf:( 


o 


1 

1 
1 




^\ > 2 


^ 


1 

, 100 


100 ZOOMiles 


1 100 


100 200 Kilometers 




r 


1 ei5!sa5^5 

^^ SUBMARINE CONTOURS IN METERS 


\^'.3 I 


/"^-^ 


\ 




'^".. \. 


Ic^ 


^ 




J 

/ > 1 


^ 








.^ 


^ \. 








o 


s 


V 

o 


\ ^ 1 \ 


♦ 


\ 


^ '?' 




\ ^ 




riS 


:•■ \ 


•n / 




^ 




\ 


A V 


O 






/ _ 
/ 




^, 


> o 11 13 V 


\ 


o 
o 






) 

1 

-/- 




W O* '' '='^"-"j \»30 * 


Vm e '^ J^c~~-o~ 




^1 




\ > )^/-^ 



Figure 3. Location map for siratigraphic section}. 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



57 



AGE 



^ (D 



1. Eel River Basin 



>- 






■«>f><»io 


) 


cc 


9 


^ 


/ 


< 


C 1 






z 


o £ o 




iiT TV 


111 








►- 


5 " ° 




-I'.— r— rA 


< 

3 


£ ^ 


o 


"•-^r-^i 


O 




in 


ji -l,w 












« 


CO 


"• *■ - 




c 

9> 




zr^^ii 
























1... - iJ 




**■ 




r\-: -^ A 




O 




---y^^-J 










> 


O 


o 


- 


<r 




o 





< 


i 




— ■ — ^ 










\ 


(E 






*r — ' — 


\ 


UJ 




[to 


"a 


\ 




c 


\l^ 


^^ 


\ 




o 


\ 


"" "^C^ 




o 










UJ 


\ 


- v^ - 








?\ 


^^ 






Paleo. 


\ 


=^:^- 




CRETACEOUS 


•^^> 










MIDDLE 


? 


:oicM 


JURASSIC 




o--^-o\ 



unconlormlty 

Wildcat Group 

of 

Ogle (1953) 

uncon(ormlty 

Bear River beds' 

unconlormlty 

Yager 
vterrane v 



.Coastal 
belt 



te 



oastal- 
rrane 



i-=i)> faults 



Central 
belt 




■T'ifij^— unconformity 



2. Point Arena Basin 



basin edge 
unconformity 



unconformity 



unconformity 
unconformity 



58 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



3. Bodega Basin 




basin edge 
unconformity 



^BS-^^T^^ basin edge 
".""^^^iv/" unconformity 



I — unconformity 



unconformity 



AGE 



C i- 
^ <D 



QUAT 



Holo. and 
Pleisl. 



< 

QC 
111 



a> 

c 

(D 
O 
O 



Lwr 



Olig. 



CRETACEOUS 



200 










Sandstone 
unconformity 

Clay, silt 

Claystone and 
siltstone 
Sandstone 
unconformity 

Cherty shale 



Sandstone 
unconformity 
Shale with 
volcanic interbeds 
■ unconformity 
Sandstone 
unconformity 
Brecciated 
sandstone 



4. Outer Santa Cruz Basin 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



59 



5. Northern Monterey Bay 
Region 




Surficiai deposits 

Aromas Sand 
Oeltaic material 

Purisima Fm. 

unconformity 

Santa Cruz Mudstone 

Santa Margarita (?) Sandstone 
unconformity 

Monterey Fm. 
unconformity 

Granitic Basement 






AGE 



1- 
< 

3 

o 


Holocene 


o 
n 


--^--^-_r 




Pleist. 


o 
o 

2K) 


',^;//». 




— -Q p. 1 


> 

< 
1- 

tr 

UI 


Pliocene 


-i-A^ 


e 
c 
« 
o 
o 

i 


o 


3 


MESOZOIC 
OR OLDER 




X 1 1 1 1 

I 1 1 1 1 1 
■ ■III 



Surficiai deposits 

Oeltaic deposits 
Aromas Sand 
Paso Robles Fm. 
Punsima Fm. 
unconformity 

Monterey Frn. 

unconformity 
Granitic Basement 



6. Southern Monterey Bay Region 



60 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



AGE 



in 

V) 

9 ID 

£5 



7. Offshore Santa Maria Basin 



QUAT. 


Hoto. and 
Pleist. 


CO 
CO 


-fc_i ■■ - T Z-^ 


> 
< 
a: 

UJ 

1- 


Pliocene 


in 


B5. 


(0 

c 
« 
o 
o 

5 


d. 


in 

CO 

la 


3^_i^ 


■6 

5 


CO 
in 

CO 


^-f' ^■- 


195 




Olig. (?) 


219 


eS?x^ 


CRETACEOUS 


? 


yv>'S^ 






and 
JURASSIC 


7 





Oceano Well 



Foxen Mudstone 



Sisquoc Fm. 

Monterey Fm. 

Obispo Fm. 
■'■ Lospe Fm. 

Great Valley sequence 

Coast Range ophiolite 
Franciscan Complex 



AGE 



« 

<»_ 

® in 

c >- 

y® 

£5 



QUAT 


Hoto and 
Pteist. 


o 
o 
m 


V V v*v ytf 


> 

< 

1- 
cc 

Ul 


Pliocene 


550 


-^=J 


« 

c 
a> 
u 
o 


o 
o 
n 


BHl^ 


^ 


T^'tF^ 


CRET. and JUR. 


250 


^"-^=-:r-Y 



8. Northern Santa Barbara Channel 
(OSC-CAL 78-164 No. 1) 



^^r^ unconformity 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



61 



9. Santa Ynez Unit and vicinity 




3^15-^ /» Offshore subsurface 



Sisquoc Formation 



Monterey Formation 

Bentonite 
Rincon Shale 
Vaqueros Formation 
Alegrla.Gaviota and 
Sespe Formations 

Sacate Formation 
Cozy Dell Shale 
Matilija Sandstone 

Anita CI Shale 

Unconf. 

Jalama Formation 



)>\N. Santa Ynez Mts. 



-I5^:.^rS Espada Formation 



Fault (?) 
Franciscan Complex 



AGE 



U 



> 

< 

(C 
UJ 

t- 


« 

c 
e 
o 
o 

OL 


d 

=> 

o 

* 
o 


o 
m 

o 
in 


ff otSiVo 


( 


' ' 0. ■ '- 


• 


o 
c 
o 
u 
o 

i 


d 


1/) 
in 






I 


o 

o 






Olig. 








Eocene 






LATE 
CRETACEOUS 


to 


'VN.^^^WN 





Pico" 
Formation 

Repetto" 
Formation 



10. Dos Quadras Oilfield and vicinity 



unconformity 

Section inferred 
below 'Repetto' Fm. 



62 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



M — 

Q) CO 

c ^ 

U (D 



AGE 



11. San Miguel Island 




£J--sM -unconformity 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



63 



AGE 



a> m 

.9fl5 
F2 



12. Santa Rosa Island 



QUATERNARY 


100 


i»»'.«.4 


- u 








o 
o 










CO 


0- V-O 6 












^'^Zzl 






•ooooao 


>A 








400 


oeo ooopp\ 






« 




To o o * o 


^ 




A » ■ «■ aajr 


■■ 






•o 




v;;.v.vM 






TJ 






.\ 






? 




;>>iaa »» ^a^vl 








*tf eo ft « 


<4 












w 








o 






















o 












CJ) 


* ■ T-'-' " " 


" 








r\j 






c 








1^ 




a> 






B « « O O 0\ 




o 






».»"«%Jr «'^"* 


■ iC 




o 






"*»•»•"•■ 


» 
















^ 






■ Ba«B^'';(«ri^ 












. 












V 














r'^_r"=.~. 












^_ _| 


>- 

cc 






o 


3^3^3 




< 




i_ 


o 


— — 




cc 




S 


CM 


^zr^zETi 






o 




_ _ , 




LU 




_i 




— 




1- 








_^~ -~^. 




_-!_'_ 












o 












o"o tt 












-TT 5~B a 




o 


i O OOOo 












in 


c^a ooo< 






Oligocene 


o o a oc 








^~ 


O 0O 004 
4 ©•Otf 




















i 




-—■- 






(D 




tr-'^V 
















<D 


o 








u 


o 


•.-■'•fc 






o 


o 


-i-^'M 






111 


•» 










^-L 










i^ i^-^^ 















nconformity 




Fault 



64 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



AGE 






13. Santa Cruz Island 



QUAT. 



>- 

IT 

< 



Pliocene 85/ 



Oligo- 
cene 



100 



B O O 0-0 

■rrr 



»e« o oo 4 



= unconformity 



ii».Jr— ""conformity 



»0OOOOOO 



Bod AO 90 



tf ••oe«04 



es«B •»••« 

•.V.'.V.'. 

O •• b O *« 

a g ft a ■ tj 



9 Red 
beds 



seclion unknown 



I subsurface only 



< 
I- 

cc 

Ul 



o 

c 

u 
o 

UJ 



Paleo- 
cene 






OOO 00«04 



•-<T -»T> 



w 

o 

Ul 

o 

< 
t- 

UJ 
CE 



Sfclton uf? 



known 



3 
,_ O 

a o 
a. n 

o 



'» e • ei b o I 
) » 6 • o A J 

' ■ *! 7 






kCSO. 


Pre. U. 
Crtl. 




^^4^ 



. subsurface only 



Fault 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



65 



AGE 



14. Northeast Coast Santa Cruz 
Island 



> 
a: 
< 
t- 
cc 

Hi 

*- 


Holo and / 

Mio Iji 

cene tin 

J^ 




Ke^ 


o 


* > V «' < V 

k V >< A J < 


400 






189 




Ag. 
und«t«rmin«d 


o 
o 


^:^ 


MESOZOIC 


7 





Monterey Formation 

Santa Cruz Island Volcanic* 
of NoK and Nolt (19691 

■ 3 San Onoira Breccia 



Franciscan Complex 



Lllhol ogles 
Inferred In part 





AGE 




CO » 

3) V 








Qual. 


Holo and 
Pleistocene 


o 

o 
en 


^'Jr-'J 




'Pico' Formation 


> 

< 

IT 
UJ 

V- 


• 
% 


d 

3 


O 

o 


=:"=^~ 


-J 


o 
1/) 


'-=-1Mj 


'Repatto' Forma 


• 
c 
• 


■o 
c 
■ 

2 


o 
in 




\ 


Monterey Stiale 


? 

7 


unconformity 


MESOZOIC 


;;';?53] 


Catalina Shale 








1 

inf 


.itriot ogles 
erred in part 





15. Offshore Santa Monica Basin 



66 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



AGE 



M 

C •- 

£5 



16. Northern Santa Rosa-Cortes Ridge 



QUAT.Holo./Plast. 


170 


—^ -Zi 


>- 

DC 

< 

tr 

UJ 

1- 


Miocene 


O 

in 
o 


= '=-j:—. 


Olig. 


o 


^0 


Eocene 


o 

CO 


■—. — — 




Paleo. 


o 

in 


'qO o~o o ^ 


o 

111 
o 
< 

(- 

LU 
CC 

o 


0) 
Q. 

a 

3 


o 

CO 

o 


=-— -J 

-7 — •?- 



o 
o 

3 
3 



AGE 



_^ <D 

£2 




17. Northern Patton Ridge 



unconformity 

r^j--^- Fault? 

-p^i /' \ Espada (?) Fm. 

yy^r / ^ I Mesozoic ? 

Franciscan (?) 
Complex 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



67 



AGE 



22 

n 



18. Santa Cruz-Catalina Ridge 



Quat. 


Holo./Pleisl 


60 


^::;.^-virrTi 


1- 


Pliocene 


iiin 


■ ■ -.■.•-■"7 


6 


3 

2 


o 


>-*v*^^T4) 


MESOZOIC(?) 


? 


a'M 



Older strata (?) 
Catalina Schist 



Thicknesses 
inferred in part 



AGE 



c is 



Ouat. 


Nolo /Pleisl 


o 


— .■ — ■ 


> 
tr 
< 

1- 

1- 


c 

o 

g 


d. 

=3 


o 

(O 
CO 


^ ""— 


(D 

$ 
O 

_l 


o 
o 

CM 


T-^-r" 


e 

c 

0) 

o 
o 

2 


Q. 

1 

■6 

5 


o 
o 

00 

? 


///// 


MESOZOIC 


? 



■Pico' Fornnation 



■Repetto' Formation 
(central) 



Monterey Shale 
(north edge) 

Catalina Schist 



19. San Pedro Basin 



Lithologies 
inferred in part 



68 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 






AGE 



P 5 



20. Newport Beach- 
Dana Point Shelf 




unconformity 
Nigel Fornnation 

Caplstrano Formation 
Monterey Shale 

San Onofre Breccia 
Topanga Formation 

Vaqueros Formation 

Sespe Formation (nonmarine) 

Santiago Formation 
Fault(?) 
Silverado Formation 



^~— ~— V Williams Formation 

- — - -\\ FaultC) Ladd Formation 

' 'nconformity 

Santiago Peak Volcanics 



unconformity 
igc 

Bedford Canyon Formation 



AGE 



C •- 



QUATERNARY 


7 


».a«aQo 


> 
tr. 

< 

LU 


9) 
C 
Q> 
U 

o 


100, 

o 

o 

(D 


■ ■■*•■' 


? 


^'- '■- *■/ 


MESO. 


Pre-U. 
Cret. 


7 


m 



— unconformity 



Fault 



21. Santa Catalina Island 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



69 



AGE 



22. San Nicolas Island 



QUAT. 



>- 




tr 


a> 


< 


c 










cr 


o 


Ol 


Ol 



0-' 



i^"n- 



jTa S^^ 



-- unconformity 




AGE 



(0 

in — 
j:5 



UJ 

1- 


Mio. 


o 

i 


o 

CO 


= -3-^ 


'^ y < -f r 

^ < V A 


MESOZOIC(?) 


7 


/, / //// 



23. San Clemente Ridge 



unconformity 



AGE 



in ^ 

O (A 

5 5 



24. Southern Guff of Santa Catalina 



QUAT 


Nolo 'Pt.tll 


150 


j.> C^__>J 


> 

< 
t- 

a 


Plioc»n« 


a 

O 


5r>>1-( 


d 

2 


2 

3 


o 

o 
o 


* » < V 


MESOZOfCI?) 


7 


i:.'i<1 



unconformity (?) 
Older strata (?) 
Cataima Sctiist 



Littioiogies and thicknesses 
Interred In part 



70 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



AGE 



^5 



25. San Clemente Island 



Ouat. 


Pliocene 


100 


•■ \ 


> 

< 

1- 
CC 
LU 

1- 


IS 

c 

<B 
O 
O 

i 


0) 

■o 


300 




o 
o 
in 







unconformity 
unconformity 



AGE 



vt 

{/) ^ 
■D (B „ 
<D c i- 

c£5 



QUAT. 
-•?-■?- 


Holocene to 


o 
o 


9 




Pliocene 


CO 






-i 












o 






MiO. 


o 


o 


? 


> 










< 
















1- 


Oligocene 






UJ 


and (or) 


o 




1- 


Eocene 


■<f 


9 




and (or) 








Paleocene(? 




7 f 


CRETA- 


o 


o 


9 










CEOUS 


a 


in 






o 







26. San Nicolas Basin 



AG 



lE (5 2 



27. Dall Bank 



1- 

UJ 

(- 


Miocene 


o 

rs. 
r) 


J;/j^ 


Oligocene 


60 




Eocene 


o 

00 




CRETA- 


a. 
a. 


o 




CEOUS 


3 








L. 


o 
at 
n 


— 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



71 



28. Thirtymile Bank 



AGE 



So 



QUAT 


Holo./Pleisl. 


SO 


=L . ■^_ . - 


CC 
liJ 


Pliocene 


120 


^^__— _r- 


MiO. 


■D d 


o 
o 
o 




MESOZOIC (?) 


(?) 


^;;a24 



Catalina Schist 



Lithologies and thicknesses 
Inferred In part 





AGE 




"3 
^1 




OUAT 


Holo.'Pleisl. 


120 


-.--.--{ 


> 

a: 

< 
1- 

Hi 

1- 


Pliocene 


340 


;^-__. ^^ 


d 


T3 

C . 

s 


o 
in 




Eocene 


280 


-^—s.-'X 


CRETA- 
CEOii'5 


Q. 
Q. 
3 


o 
to 


K-f-y/il 


JURA 


SSIC 


2 
d 

3 


7 


A 7"J A 



San Diego Formation 

(Coronado Bank) 
Unconf.(?l Monterey Shale 
Unconf. "-a Jolla Group 
Cabrillo Formation 
Pt. Loma Formation 
Unconf. Lusardi Formation 
S. C. batholith 

Santiago Peak Volcanics 



29. San Diego Shelf 



30. Fortymile Bank 





AGE 




o in 

i5? 






PUAr 

E 
UJ 

»- 


Molo to Pllo 


100 


^~='\ 


MiO. 


o 


o 
o 
o 


M% 


1 


MESOZOIC C) 


7 


g£2g 










L 
lnt< 


ithoiogies 
»rred in part 



Unconformity 
Catalina Schist 



72 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



AGE 



.^2 



31. Central Blake Knolls 



TERT. 


Miocene 


370 


:>iX.\ 


MESOZOC (?) 


? 


////// 



unconformity 
Catalina Schist 



AGE 



O (0 



cc 

< 
1- 

UJ 


Mio. 


L. 
anC 

M. 


o 
o 


?--l(^ 


^ V < V Aj 


Oligocene 


U 
o 


^^-=_| 


Eocene 


o 
<o 
in 


uS^ 




Paleocene 


270 


^_ ■_: _ 


CRETA- 
CEOUS 


« 
a 
a 

D 
"O 

c 
a 

e 

o 


o 
o 


_7 7- 


\ 



32. Cortes Bank 
(OSC-CAL 75-70 No. 1) 



unconformity 



TD 3100 m 



33. Northeast Bank 



AGE 



CO . 
0) 0) 

C != 



P'S 



cc 

UJ 


Pllocene 
— 7 — ?- 

Miocene 


o 
m 

00 


A < 1 »' 

r -r V > 
-I < 7^1' 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



73 



BIBLIOGRAPHY 



This bibliography includes those references studied and, 
in part, used to compile the California continental margin 
geologic maps. Also included are references that, because 
of their scale or subject, were not used directly in this 
compilation, but which may be useful to investigators in- 



volved in geologic studies within the region. The refer- 
ences consist of published geologic data and unpublished 
Master's and Doctoral theses that are readily available, as 
well as open-file reports, administrative reports and re- 
cently released proprietary data. 



AqIIo, K.R., 1982, The Franciscan Complex of northernmost Califor- 
nia: sedimentation and tectonics, in leggett, J.K., editor. Trench 
forearc geology, sedimentation and tectonics on modern and 
ancient active plate margins: Geological Society of London, p. 
419-432. 

Adoms, M.V., 1973, Report on water injectivity test, lease OCS-P 
0241, well number B-49-1, Dos Cuadros Field, Santa Barbara 
Channel, off California: U.S. Geological Survey Circular 687, 28 

P 

Agnew, D.C., 1979, Tsunami history of San Diego, in Abbott, P.L. 
and Elliott, W.J., editors. Earthquakes and other perils, San 
Diego region: San Diego Association of Geologists Guidebook, 
p. 117122. 

Agnew, D.C., Legg, M., and Sirond, C, 1979, Earthquake history of 
San Diego, in Abbott, P.L. and Elliott, W.J., editors. Earthquakes 
and other perils, San Diego region: Son Diego Association of 
Geologists Guidebook, p. 123-138. 

Albee, A.L., and Smith, J.L., 1966, Earthquake characteristics and 
fault activity in southern California, in Lung, R., and Proctor, R., 
editors. Engineering geology in southern California: Association 
of Engineering Geologists Special Publication, p. 9-33. 

Aldrich, J.K., 1969, Grovity of northern Channel Islands: American 
Association of Petroleum Geologists Bulletin, v. 53, p. 470. 

Aldrich, J.K., 1969, Grovity survey of the Santo Barbara Channel 
Islands: University of California, Sonto Barbara unpublished 
Master's Thesis. 

Allen, A. A., and Schleuter, R.S., 1969, Estimates of surface pollution 
resulting from submorine oil seeps ot Cool Oil Point ond Platform 
A: General Research Corporation, Santo Barbara, California, 
Technical Memorandum 1230, 43 p. 

Allen, A. A., Schleuter, R.S., and Mikolaj, P.G., 1970, Natural oil 
seepage at Coal Oil Point, Santa Barbara, California: Science, 
V. 170, p. 974-977. 

Allen, C.R., St. Amond, P., Richter, C.F., ond Nordquist, J.M., 1965, 
Relationship between seismicity and geologic structure in the 
southern California region: Seismological Society of America 
Bulletin, V. 55, p. 753-797. 

Allen, C.R., Silver, L.T., and Stehli, F.G., 1960, Aguo Blanco fault — a 
major transverse structure of northern Bajo California, Mexico: 
Geological Society of America Bulletin, v. 71, p. 457-482. 

Allen, D.R., and JoujonRoche, J.E., 1958, West Newport Oil Field: 
American Association of Petroleum Geologists and Society of 
Economic Paleontologists and Mineralogists, Pacific Section, 
Guidebook, p. 142- 144. 

Alpha, T.R., 1970, Physiographic diagrams of ports of the continen- 
tal borderlands of California and Alosko: U.S. Geological Survey 
Open File Report 70-5. 

Alpha, T.R., 1971, Physiographic diagram of southern California, in 
Elders, W.A., editor. Geological excursions in southern Califor 
nio: Geological Society of America, Cordilleran Section Meeting, 
University of California, Riverside. 

Alpha, T.R., 1972, Physiographic diagrams for Venturo-Oxnard off- 
shore, Astoria Canyon and Fon, Newport, Northern Bering Seo, 
the Aleutian-Kamchotko convergence, Caribbeon Arc-Hitpaniolo 



to Guadalupe, Bohio de Compeche, British Honduras and Vene- 
zuelan borderlond: U.S. Geological Survey Open File Report 
72-5, 9 sheets. 

Alpha, T.R., 1978, Oblique mop of Monterey Boy, California: U.S. 
Geological Survey Open-File Report 78-681. 

Alpha, T.R., 1978, Southern California borderland; oblique map of 
the northwestern part: U.S. Geological Survey Open-File Report 
78-967. 

Alpha, T.R., 1978, Regional geologic and geophysical base mops of 
western North America and adjacent oceans: U.S. Geological 
Survey Open-File Report 78-603. 

Alpha, T.R., 1980, Oblique map of the Pacific Coast of North Ameri- 
co, U.S. Geological Survey Open-File Report 80-93. 

Alpha, T.R., and Gerin, M., 1980, Oblique mop of the northern 
California continental margin: U.S. Geological Survey Open-File 
Report 80-195. 

Alpho, T.R., Dingier, J.R., Jones, D.R., Molion, D.E., Peterson, DC, 
and Morely, J.M., 1981, Physiographic diagram of the upper 
Cormel Canyon and Point Lobos, California: U.S. Geological 
Survey Open-File Report 81-440. 

Anderholt, R., LeFever, R.D., and Reed, W.E., 1977, Texture versus 
depth, and mainland versus offshore relationships, southern Cali- 
fornia borderland: Geological Society of America Abstracts with 
Programs, v. 9, p. 379. 

Anderholt, R., and Reed, W.E., 1978, Organic corbon and texture 
of benthic and intertidol sediments, southern California continen- 
tal borderland: Geologicol Society of America Abstracts with 
Programs, v. 10, p. 358. 

Anderson, D.L., 1971, The Son Andreas fault: Scientific Americon, 
v. 255, p. 53-66. 

Anderson, J.G., 1979, Estimating the seismicity from geologic struc- 
ture for seismic risk studies: Seismological Society of America 
Bulletin, V. 69, p. 135 158. 

Anderson, J.G., 1984, The September 4, 1981 Sonto Borboro Islond, 
California earthquake: Interpretation of strong motion doto: Bul- 
letin of the Seismological Society of America, v. 74, p, 995-1010. 

Anderson, J.G , Trifunoc, M.D., Teng, T.L., Amini, A., and Moslem, 
K., 1981, Los Angeles vicinity accelerogroph network: University 
of Southern Californio, Department of Civil Engineering Report 
CE 81-04 

Anderson, RE., Redwine, I.E., and McGovney, P.E., 1949, Geology 
of northern Sonto Rosa Island, California: American Associotion 
of Petroleum Geologists Bulletin, ». 33, p. 2062. 

Andrews, R.S., Cepk, R.J., and Wilson, O.B., Jr., 1972, Moss physi- 
cal and acoustic properties of sediments from the Monterey 
Submarine Fan: American Geophysicol Union Transactions, v. 
53, p. 1028. 

Arends, R.G., 1980, Diatoms and silicoflogellates from Molocene 
sediments, southern California continental borderland; American 
Association of Petroleum Geologists Bulletin, v. 64, p. 438. 

Arleth. K.F., 1977, Marine structural geology and geologic evolution 
south of Santo Rosa and Son Miguel Islands, California: San 
Diego Stote University unpublished Mosler's Thesis. 



74 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



Arleth, K.F., 1979, Structure ond seismic stratigraphy south of Santa 
Rose and San Miguel Islands, California: Geological Society of 
America Abstrocts with Programs, v. 11, p. 380. 

Arnol, R.E., 1976, Miocene poleobathymetric chonges of the Sonto 
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78 



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Crouch, J.K., 1979, Marine geology and tectonic evolution of the 
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tin, V. 57, 774 p. 



80 



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BULLETIN 207 



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Dill, R.F., 1965, Bothyscoph observations in the La Jollo submarine 
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Dill, R.F., 1967, Processes of submorine erosion in La Jollo fan-volley 
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Dill, R.F., 1969, Pleistocene sea-level fluctuations off southern Cali- 
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Dill, R.F., 1969, Earthquake effects on fill of Scripps submarine 
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Dill, R.F., Dietz, R.S., and Stewart, H.B., 1954, Deep-sea channels 
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Douglas, R.G., and Heitman, H.L., 1979, Slope and basin benthic 
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Douglas, R.G., Liestman, J., and Cotton, M.L., 1979, Benthic foromi- 
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Durham, J.W., 1956, Pacific coast Cretaceous from Vancouver Is- 
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Edwards, B.D., 1979, Animal-sediment relationships in dysoerobic 
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Edwards, B.D., 1980, Lebensspuren of dysoerobic, bathyal basin, 
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Edwards, B.D., 1980, Mass movement effects on o bathyal mac- 
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Edwards, B.D., 1982, Geologic hazards in Santa Monico basin: U.S. 
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Edwards, B.D., 1985, Bioturbation in a dysoerobic, bathyal basin: 
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Edwards, B.D., and Field, M.E., 1980, Sedimentary processes active 
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Edwards, B.D., Field, M.E., Carlson, P.R., and Kenyon, N.H., 1984, 
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Edwards, B.D., Field, M.E., and Clukey, EC, 1980, Geologicol and 
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Edwards, B.D., and Gorsline, D.S., 1978, New evidence of current 
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Edwards, L.M., 1967, Directional sedimentary rock structures, Mio- 
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Elliott, W.J., 1966, Grovity survey and analysis of Son Diego em- 
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Elliott, W.J., 1970, Gravity survey ond regional geology of the Son 
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Elsworth, W.L., Campbell, R.H., Hill, D.P., Page, R.A., Alewine, R.W., 
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Emery, K.O., 1951, Continental shelf — southern Colifornio, in Boll, 
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Emery, K.O., 1952, Continental shelf sediments of southern Califor- 
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Emery, K.O., 1954, General geology of the offshore area, southern 
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Emery, K.O., 1954, Source of water in basins off southern California: 
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Emery, K.O., 1958, Shallow submerged marine terraces of southern 
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Emery, K.O., 1958, Southern Colifornio basins, in Weeks, L.G., 
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Emery, K.O., 1960, Bosin ploins and aprons off southern California: 
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Emery, K.O., 1960, The seo off southern Colifornio, o modern habi- 
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Emery, K.O., and Bray, E.E., 1962, Radiocarbon dating of California 
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Emery, K.O., Butcher, W.S., Gould, H.R., and Shepord, F.P., 1952, 
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Emery, K.O., ond Dietz, R.S., 1950, Submarine phosphorite deposits 
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Emery, K.O., and Hoggon, D., 1958, Gasses in morine sediments: 
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Emery, K.O., and Hulsemonn, J., 1963, Submarine canyons of south- 
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Emery, K.O., and Rittenberg, S.C, 1952, Early diogenesis of Califor- 
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Emery, K.O., and Shepord, F.P., 1945, Lithology of the sea floor off 
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Emery, K.O., ond Terry, R.D., 1956, A submarine slope of southern 
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Ericson, D.B., Ewing, M., ond Heezen, B.C., 1951, Deep-sea sands 
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Erickson, J.W., 1972, Poleoslope ond petrogrophic onolysis of the 
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Erickson, J.W., 1975, Sedimentology of the South Point Formation 
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Erickson, J.W., 1975, Petrology of some middle ond lote Eocene 
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83 



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Evenson, R.E., and Miller, G.A., 1963, Geology and ground-water 
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Fabiono, E.B., and Peddie, N.W., 1969, Grid values of total mag- 
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Felix, D.W., 1968, Economic evaluation of Coronodo Bank phos- 
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Felix, D.W., 1969, Origin and recent history of Newport submarine 
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Felix, D.W., 1969, Origin and recent history of Newport Canyon, 
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Felix, D.W., and Gorsline, D.S., 1971, Newport submarine canyon, 
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Felsher, Murray, 1969, The Santo Cruz Canyon system, continental 
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Field, M.E., 1976, Shallow structure of northern Santa Rosa - Cortes 
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Field, M.E., 1980, Off-shelf sediment transport by slides and flows, 
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Field, M.E., 1981, Sediment mass transport in basins: controls and 
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Field, M.E., and Clarke, S.H., Jr., 1977, Submarine slumps and 
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Field, M.E., and Clarke, S.H., Jr., 1979, Small-scale slumps and slides 
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Field, M.E., Clarke, S.H., Jr., and Greene, H.G., 1977, Evaluation of 
geologic hazards in outer continental shelf petroleum lease 
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Field, M.E., Clarke, S.H., Jr., Greene, H.G., Molnio, B.F., Carlson, 
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Field, M.E., Clarke, S.H., Jr., and Kvenvolden, K., 1980, Diapir-like 
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Field, M.E., Clarke, S.H., Jr., and White, M.E., 1980, Geology and 
geologic hazards of offshore Eel River basin, northern California 
continental margin: U.S. Geological Survey Open-File Report 
80-1080, 80 p. 

Field, M.E., and Edwards, B.D., 1979, The role of mass movements 
in basin filling; evidence from the California continental margin: 
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p. 425. 

Field, M.E., and Edwards, B.D., 1980, Slopes of the southern Califor- 
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Field, M.E., and Edwards, B.D., 1981, Large submarine slump off 
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Field, M.E., Edwards, B.D., and Chezar, H., 1984, Sediment patterns 
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Field, M.E., Edwards, B.D., Kenyon, N.H., and Somers, M.L, 1984, 
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Field, M.E., Edwards, B.D., Kenyon, N.H., Somers, M.L., and Hey, 
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Field, M.E., Edwards, B.D., and Gardner, J.V., 1984, Side-scan sonar 
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Field, M.E., and Gardner, J.V., 1980, Shale diopirism on the northern 
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Programs, v. 8, p. 425. 

Field, M.E., Gardner, J.V., Jennings, A.E., and Edwards, B.D., 1981, 
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Field, M.E., Gardner, J.V., Jennings, A.E., and Edwards, B.D., 1982, 
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Field, M.E., Jennings, A.E., Gardner, J.V., Chose, T.E., Miller, C.P., 
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Field, M.E., Kvenvolden, K.A., and Clarke, S.H., 1979, Location and 
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Field, M.E., and Richmond, W.C, 1980, Sedimentary and structural 
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Fischer, P. J., 1972, Geologic evolution and Quaternary geology of 
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Fischer, P. J., 1973, Environmental hazards of the northern Santa 
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Fischer, P.J., 1976, Late Neogene-Quoternory tectonics and deposi- 
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Fischer, P. J., 1976, Tectonic clossification of shelves, California con- 
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Fischer, P. J., and Berry, R.W., 1978, Offshore fine sediment trans- 
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Fischer, P.J., and Berry, R.W., and Reed, W.E., 1976, Southern 
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Fischer, P. J., and Kolpock, R.L., 1971, Marine geology of the north- 
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Fischer, P. J., and Lee, C.F., 1974, Structural control of submarine 
canyons, southern California: Geological Society of America Ab- 
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Fischer, P. J., Rudat, J., and Ticken, E., 1979, Recognition of active 
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Society of Americo Abstrocts with Programs, v. 11, p. 78. 

Fischer, P. J., and Stevenson, A. J., 1973, Natural hydrocarbon seeps 
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American Association of Petroleum Geologists, and Society of 
Economic Paleontologists and Minerologists, Pacific Sections, 
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Fischer, R.V., and Charlton, D.W„ 1976, Mid-Miocene Blanco For- 
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Aspects of the geologic history of the California continental 
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Fleischer, P., 1969, Mineralogy of Holocene basin sediments, Califor- 
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Fleischer, P., 1970, Effect of late Pleistocene sea level rise on basin- 
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86 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



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Greene, H.G., and Kennedy, M.P., 1980, Addendum to review of 
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323-324. 



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Hawkins, J.W., ond Hawkins, D.L., 1977, Petrology, geochemistry 
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Hess, G.R., and Normark, W.R., 1976, Holocene sedimentation his- 
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Hess, G.R., and Normark, W.R., 1980, Quaternary styles of Califor- 
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BULLETIN 207 



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leontologists and Mineralogists, Pacific Sections, Special 
Publication, p. 1 1-13. 

Weaver, D.W., and Doerner, DP., 1967, Western Anocopo — a sum- 
mary of the Cenozoic history of the northern Channel Islands: in 
Philbrick, R., editor. Proceedings of the symposium on the biology 
of the California Islands: Santo Barbara, California, Santo Bar- 
bara Botanic Garden, p. 13-20. 

Weaver, D.W., and Doerner, D.P., 1969, Lower Tertiary stratigra- 
phy, San Miguel and Santa Rosa Islands, in Weaver, D.W., 



108 



DIVISION OF MINES AND GEOLOGY 



BULLETIN 207 



editor, Geology of the northern Channel Islands: American As- 
sociation of Petroleum Geologists and Society of Economic Pa- 
leontologists and Minerologists, Pacific Sections, Special 
Publicotion, p. 30-47, 

Weaver, D.W., and Doerner, D.P., 1969, Mid-Tertiary stratigraphy, 
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northern Channel Islands: American Association of Petroleum 
Geologists and Society of Economic Paleontologists and 
Mineralogists, Pocific Sections, Special Publication, p. 80-84. 

Weaver, D.W., Griggs, G., McClure, D.V., and McKey, J.R., 1969, 
Volcaniclastic sequence, south-central Santo Cruz Island, in 
Weaver, D.W., editor, Geology of the northern Channel Islands: 
American Association of Petroleum Geologists and Society of 
Economic Paleontologists and Mineralogists, Pacific Sections, 
Special Publication, p. 85-90. 

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northern Channel Islands: American Association of Petroleum 
Geologists and Society of Economic Paleontologists and 
Mineralogists, Pacific Sections, Special Publication, p. 95-104. 

Weaver, D.W., and Wilhelm, V.H., 1943, Huntington Beach oil field, 
in Geologic formations ond economic development of the oil and 
gas fields of California: California Division of Mines Bulletin 1 18, 
p. 329-331. 

Weber, F.H., Jr., 1963, Geology and mineral resources of San Diego 
County, California: California Division of Mines and Geology 
County Report 3. 

Weber, G.E., ond Cotton, W.R., 1981, Geologic investigation of 
recurrence intervals and recency of faulting along the Son Gre- 
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Survey Open-File Report 81-263, p. 133. 

Weber, G.E., ond LoJoie, K.R., 1977, Late Pleistocene and Holocene 
tectonics of the Son Gregorio fault zone between Moss Beach 
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Society of America Abstracts with Programs, v. 9, p. 524. 

Weber, G.E., ond LoJoie, K.R., 1980, Mop of Quaternary faulting 
olong the San Gregorio fault zone. Son Mateo and Santa Cruz 
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80-709, scale 1:24,000. 

Weeks, L.A., and Lottimore, R.K., 1971, Continental terrace and 
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Wehmiller, J.F., La Joie, K.R., Kvenvolden, K.A., Peterson, E., Belk- 
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Wehmiller, J.F., Peterson, E., Kvenvolden, K.A., Lojoie, K.R., ond 
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Wesson, R.I., Bennett, R.E., and Lester, F.W., 1972b, Catolog of 
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Wesson, R.L., Lester, F.W., and Meagher, K.L., 1974b, Catalog of 
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Wilde, P., 1965, Estimates of bottom current velocities from groin 
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Wilde, P., 1965, Recent sediments of the Monterey deep-sea fan: 
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Wilde, P., 1965, Recent sediments of the Monterey deep-sea fan: 
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Wilde, P., Normark, W.R., ond Chose, T.E., 1976, Oceonogrophic 
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Wilde, P., Normork, W.R., and Chose, T.E., 1976, Petroleum poten- 
tial of continental rise off central Colifornio — summary, in Cir- 
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Wilde, P., Normark, W R., and Chose, T.E., 1978, Channel sands ond 
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American Association of Petroleum Geologists Bulletin, v. 62, p. 
967 983. 

Wilde, P., Normark, W R., and Chose, T.E., 1980, Potentiol petro 
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Association of Petroleum Geologists Bulletin, v 64, p. 803. 

Wildhorber, J.L., 1966, Suspended sediment over the continentol 
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Wilkinson, E.R., 1972. Colifornio offshore oil ond gas seeps: Califor- 
nia Division of Oil ond Gas Report, 1 1 p. 

Willis, D.K., 1979, Texturol comporiion of insular ond moinlond shelf 
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Willis, R.B., 1958, Sunset Beach oil field, in Higgins, J.W., editor, A 
guide to the geology and oil fields of the los Angeles ond 
Venluro regions: American Association of Petroleum Geologists, 
Pacific Section, p 88 



1987 



GEOLOGY OF THE CALIFORNIA CONTINENTAL MARGIN 



109 



Wilson, J.C., Jr., 1970, Engineering properties of southern California 
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Wilson, T.A., and Mero, J.L., 1966, Economic deposits of the Califor- 
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Wimberly, C.S., 1955, Marine sediments north of Scripps submarine 
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Wimberly, C.S., 1963, Sediments of the mainland shelf near Santa 
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Wimberly, C.S., 1964, Sediments of the southern Calif ornio main- 
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Winterer, E.L., Curroy, J.R., and Peterson, M.N. A., 1968, Geologic 
history of the intersection of Pioneer Fracture zone with Delgada 
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509-520. 

Winterer, E.L., Hawkins, J.W., Matthews, J.L., and Allison, E.C., 
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Wolf, S.C., 1968, Current patterns and mass transport of clastic 
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Wolf, S.C, 1970, Sedimentation and coastal currents over the shelf 
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Wolf, S.C, 1975, Seismic reflection profiles, R/V POLARIS, March 
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Wood, H.O., and Heck, N.H., 1951, Earthquake history of the 
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Woodford, A.O., 1924, The Catalino metomorphic facies of the 
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Woodford, A.O., 1925, The Son Onofre Breccia: University of Cali- 
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Woodford, A.O., 1951, Stream gradients and Monterey Sea Valley: 
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Woodford, A.O., and Bailey, T.L., 1928, Northwestern continuation 
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Woodford, A.O., and Gander, C, 1977, Los Angeles erosion surface 
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Woodford, A.O., and Howell, D.G., 1980, Eocene conglomerate 
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Woodring, W.P., and Bramlette, M.N., 1950, Geology and paleon- 
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Woodring, W.P., Bromlette, M.N., Kew, W.S.W., 1946, Geology 
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Woodson, W.B., III, 1973, A bottom gravity survey of the continental 
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Wornardt, W.W., Jr., 1973, Diatom, silicoflogellote, radiolarion, 
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pects of the geologic history of the Colifornio borderland: Ameri- 



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hiL/^^;!:"'"""^'^ °' California, dav.s 



,^ 



UNIVEHSITV OF CALIf 



3 1175 02103 8065 






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CALIFORNIA CONTINENTAL MARGIN GEOLOGIC MAP SERIES 

MASTER LEGEND AND EXAMPLE SEISMIC REFLECTION PROFILES 

WITH SYMBOLS AND TERMINOLOGY. (PLATE 1) 




300- 

600- 

ti! 900- 






1800. 




1200- -_. 



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DIVISION OF MINES AND GEOLOGY 

BRIAN E, TUCKER, ACTING STATE GEOLOGIST 



STATE OF CALIFORNIA-GEORGE DEUKMEJIAr 

THE RESOURCES AGENCY -GORDON K VAN VLECK, SECHEl 
DEPARTMENT OF CONSEHVATION-RANDALL M WA 



Master Legend orSiratigraphic Units 

I Q I LifKoriolidaKiJ deposits of Quaiernaiy age 
Of FandcposibofQuaieTnary age 
Od DcM;iicdep<Hitso( Quaternary age 
Igjjm'l Deliait depcKiu of QuBicrnnry age overlain by ihick (grcaKr ihon 3m i dcpasiis of Q 
[ Qcf I ( .iFni>n or channel fill deposiwof 0"niernary age 

Ql I I iiuins.'lidalcd marine ictracedepotiU of probable Pleistocene 3^e 
-^ n.iiiidaied marine thcif and slope deposiu nf late Pleistocene age 

:K ihai may corrcliic with the San IVdro Formation 
KcdSanditmustiy uncontolidsiedquarizoK sandofPleislonne agel. 

Red Sanditmcstiy unconuilidaicd quariuiic sand of Pleistocene agei overlain by ihiek 

' ^ ^.'.f (fisn 3m) depcnils ol Q. 



1. GEOLOGIC CONTACT 
(buttress unconformity) 



2. GEOLOGIC CONTACT 
(ponded sediments) 



3. GEOLOGIC CONTACT 
(ponded sediments) 



SedimenI and sedimentary rock of Quaternary and Tertiary (Pliocene and Miocene) age. 
Teriiary C*) age 

and Pleistocene age that may corrcli 



'^lidatcduniiofsund. gravel, etay and tuff of Pliocene and PlciMocene age that may 

ate with the 1^0 Robles Formation, and IS overlain by thick (greater than 3mldc[>niitiof Q 



I Off Terrace deposiu of Quaternary and 

SUnc- 
*.rb 

I Tp [ \tilimcniary rockof Phocenc age 

fo/^j Sclimcntary rock o( Pliocene age overlain by thick Igrcaier than 3m) deposiii of Q 

I Tpp I f^J^lMma Formation (marine sandstone and wltnone of Pliocene age). 

le/T>^l Pu'""";! Formation (manresandiione and siltsTone of Pliocene age) overlain hyihick(t;'eaier 
r^"] than iml deposits of Q 

I Tpr I Sedimentary rock of early Pliocene and late Miocene age 

I Tm I Sedimentary rock of Miocene age 

I Q/Tm I Sedimentary rock of Miocene age overlain by thick (greater than 3m) deposits of Q 

I^^P Viilunic rock of Miocene age 

I ^"^ 1 Vnltanic and sedimentary nock of Miocene age 

^^^1 Sania Crui Mudsione (siliceoui organic mudiionc of Miocene age) 

H Santa CruiMudslonel&iliceous organic mudstone of Miocene age) overlain by thick (greater 
ihan 3m) deposits of Q, 

^^H Santa Margariu Formation (sandstone and arkosic sandstone of Miocene age). 

IJMJIffMI Santa Margarita Formation Isandilonc and arkosic sandstone of Miocene age) oveilain by ihick 
bBp»«1 (greater than 3m) deposits of Q 

^^^1 Monterey Formation (siliceous sandstone, silistone and mudstone of Miocene age). 

■ Monterey Formation (siliceous sandstone, silistone and mudstone of Miocene age) overlaifl by 
Ihick (greater Ihan 3m) deposits of Q 

^^^H Plutonic and hypabyssal rock of Miocene age 

^^^1 Sedimentary rock of Oligoccne age 

I 1a\ SfdimentaryrtKk of Eocene age 

' ■ i. [iiary rock of Eocene and Rileoccne age 

I" Formation (sandstone, tjlutone. mudstone and cobble-pebble conglomerate of 



cage) 
1. 1 niaty rock of Tertiary age, 
ii.inic riKk of Ternary age 
Jirncniary rock of late Cretaceous age. 



ED 

I ^^ I Sedimentar>' rock of Cretaceous age 

^^H Undiftereniiaicd Igneous rock of Miocene age and mctamorphic rock of pre-late Cretaceous age 



:rlhan 3m) deposits of Q, 



^^H Melamorphicrockol pre-latcCi 

[g^ (jr.iiiiiit rock, chiefly dioiile, of Mcsowic age 

j gop I fiirphynlicgranodjortle. 

[ jjj j Mcumorphiciock of unknown age 

I Q/m ] '^''^'■'""■'fph'c rock of unknown age overlain by (hick (grc. 

I ffj^ I (r.in^i«anComplM. Coastal Belt 

^^^1 l-rjnu^anComplei, undifferentiated 



HIGHLIGHTED BOXES INDICATE UNITS DEPICTED ON THIS PLATE. 




GEOLCXjIC CONTACT quened where eon- 
■act IS uncertain. All contacts arc eitrapolaled 
from scismtc-relleclion data and are approii- 
male m location Eiample from sparker profile 
of upper Tefliafy and Quaternary (QTs) sedl' 
ment, ponded in ^ynclinally folded strata on 
\\apt of pre%umed Miocene (Tm'') sediments. 
LJxated in the Gulf of Santa Cstalma west of 
Dana Pomi, inner southern California continen- 
tal borderland 



B. FAULT 

(Pleistocene) 




GEOLOGIC CONTACT quined where contact is un- 
certain All contacts arc e:(trap]late<l from seismic-rcflcc- 
lion data and are apprommattin location Example from 
Uniboom profile of sedimcrl of Quaternary (Q) age 
ponded m synclinatly folded ilrata on slope of Miocene 
(Tm) sedimentary rocks. l.oca\ed south of San Nicolas 
Island, middle southern Calfomia continental bonder- 



9. FAULT 
(Tertiary) 




- 825- -^S^ __; -."i: 























1 


1 




\ 
\ 


4 SO 












t> 




- 














i 


















a 






^< 


^^ 












fl 






1^ 


\ 








" 




\ 




i 


^ 


S 


? 


I 


hi 




/ 


- 


■; 


600- 








'i 


i^ 


M 












!>._a 




67 5- 






'- 


^ 








■ ' 


_- 1 




4. FAl 

(see 
expi 



fl 



GEOLOGIC CONTACT quened where contact i% unccnam 
All contacts arc citrapolatcd from seismic -re flee Hon data and 
are apprommate in location Enomple from Llniboom profile of 
unconsolidated Quaternary (Q) sediment ponded between base 
of slope and exposed bedrock 171 of probable Miocene (TM"") 
age located in the Gulf of Santa Calahna. inner southern Cal- 
ifornia conlineniol borderland 



10. FAULT 

(Quaternary) 



11. FAULT 

(Quaternary and 
Lale Tertiary) 








i 


675- 


" 


|« 


a 




"^ i^m^^Z^r^J^ 


975- 




' ^ 



FAULT solid where well defined, dashed where inferred. 
queried where uncertain Faults designated by divided txtites 
indicate that strata of late Tertiary and Quaternary age are 
cut Oneof these hasseaflooretpression, indicated by bar and 
age symbol on downlhrown side, another reaches but docs 
not displace seaflour. as indicated by age symbol nstnde fault 
"D" designates downlhrown block. "U" designates up- 
thrown block EiampIc from sparker profile within Loma Sea 
Valk). inner southern California continental borderland. 



<50- 






/^ 




■iiS- 


._:- 




/f .- 




800- 


Tm 


TP :^ 


Tm 


V\ 


675- 


■y .- 










338- 




"1 1° 






II 


ff 






i;; 413- 


/ 




3 


z\ 


tl 

0T.|| 


4R8- 


'■•/// J 






"1 


II 



Fault solid where well Jefincd. dashed where inferred, 
quened where uncertain FilW inangle (age symbol) in- 
dicates youngest strata cm »fe Pliocene (Tp) mage Fold- 
ed Miocene (Tm) sedimemary rock is overlain by 
Pliocene strata, both h; in fault contact with exposed 
t^rock ndge of folded Miocene strata Example from 
sparker profile across mainland *ficlf near Carlsbad, inner 
MUthem California cuntii""*' borderland. 



FAULT solid where well defined, dashed where in- 
ferred, queried where uncenain Divided box ostndc 
fault symbol indicates fault does not have seaftoot ex- 
pression and that youngest strata col are of late Terti- 
ary and Quaternary (QTs) age "D" designates 
downthrown block. ■'U" designates upthrown block 
Fault extends to base of -'l>ubblc pulse," but apparently 
does not reach the seafloor Note two unconformities 
within strata to right of fault Example from sparker 
profile across inner southern Cahfomia conHnenlal 
borderland near Newport Bcacli. 



Fault solid where well c 
where uncertain Open ciri 
does not have scaflooi cxpi 
cut arc late Ternary and (. 
fault symbol indicates that 
ternary in age "D" designs 
upthrown bicck Fault ui fu 
ternary (QTj) ond older u 
Miocene (Tm) rocks Esan 
across San Diego shelf. Lom 
southern California conline 



lA-GEORGE DEUKMEJIAN. GOVERNOR 

>HDON K VAN VLECK, SECRETARY FOR RESOURCES 

nservation-randall m ward, director 



C3 



PHVSICAI SCIENCES 
LIBRARY 

IJC DAVIS 



CALIFORNIA CONTINENTAL MARGIN GEOLOGIC MAP SERIES 

MASTER LEGEND AND EXAMPLE SEISMIC REFLECTION PROFILES 
WITH SYMBOLS AND TERMINOLOGY. (PLATE 1) 



4. FAULT 
(seafloor 
expression) 



5. FAULT 
(seafloor 
expression) 



6. FAULT 
(seafloor 
expression) 










T 


■s— 








263- 


1 


M 


9 


Hi 




H 


SS^^^HjH- 


338- 


•,> 


t ^ 




M 


^ 


*•'"* 




- 



FAULT iolid where well denned, da&hed where inferred, queried where 
uncertain Bar and a|e symbol «hown on downihrown side of fauli wiih 
•teai\<x>t expreuion Fnuli displaces jeafloor. olTseiting acou&iicaliy transpar- 
cnl unil (QTi) of presumed late Ternary and Qualcmary age Example from 
I 5 kKi profile acrcs> inner souihem CalifomiD conlinenlal borderland near 
San Diego 




FAULT solid where well defined, dashed where mferred, qucned 
where uncertain Bar and age symbol shown on downlhrown side of 
fault ihal hu seaFtoor expression Fault displaces seafloor. offsetring 
sediments of presumed laie Tertiary and Quaternary (QTs) age and 
juntaposmg subjaceni units of Miocene (Tin) and possibly Pliocene 
[Tp**) ages Also nolc inferred fault wilhin probable Miocene section, 
and folded siraia Example from Uniboom profile across Tanner Bank, 
middle southern California continental borderland (after Greene and 
Olhen. 1975, Iheir Figure 3) 




J ,- 



FAULT solid where well defined, dashed where inferred, queried 
where uncertain Bar and age symbol shown on downlhrown side of 
fault that has seafloor enpreuion. Fauli displaces seafloor. oflsetiing 
units of laie Tertiary amd Quaternary (QTs) age and juilaposing 
subjacent units of probable Miocene (Tm?) age Example from ^rkcr 
profile across mainland shelf, inner southern Califomli continental 
borderland near Occanside 



FAULT solid where well defined, dashed where inferred, que- 
ried where uncenain Bar and age symbol shown on down- 
lhrown side of fault that has leafloor cxpreuion Divided boi 
indicates youngest strata cut are of Quaternary age Note thai 
one questionable and four inferred faults cutting Miocene (Tm?) 
or older strata arc indicated by open mangles asindc fault sym- 
bol "D" designates downlhrown block, "U" designates up- 
thrown block These strata are also folded, as shown by anticline 
and syncline symbols Eumple from sparker profile across Gulf 
of Sania Caialina. inner southern California conlinental border- 
land. 




15. FAULT ZONE 



0- 










. , 1 




J-° 




n 






1 


P 


If 


1 

- -0,i 


1 250- 


HHv 


-i 


! lii! 


- \ 




' 


': 'K'.'?'?^' 


W i'i^.ifr 


A - 




J 






!"!■' 




&0i - 


i. ..-J .... 








;:::;^l:; 


' :'lM'^ 




m-A:^, 


fMi^kl-ii., 


■nw 


i/jh 


■-ii^,„ 



FAULT uhd where well defmcd. dashed where inferred, queried 
where uncertain. Open circle astnde fault symbol indicates fault 
does noi hive seafloor eiprcssiun and (hat youngest strata (QTs| 
cut are lait Tertiary and Qualemary in age Divided bo» asinde 
fault symbol rndicaics that the strata cul ate undiffercntialed Qua- 
ternary m tge. "D" designates downlhrown block, "U" designates 
upihrown block Fault at far left junlaposei laie Ternary and Qua- 
lemary (QTs) and older units with an exposed bedrock ndgc of 
Miocene (Tm I rocks. Biample of fauli ion e from Uniboom profile 
across San Diego shelf, Loma Sea Valley, and Coronado Bank, inner 
southern California continental borderland. 



FAULT solid where well defined, dashed where in- 
ferred, qucned where uncertain Open circles asinde 
fault symbol indicates faults do not have seafloor ex- 
pression and youngcsi slrala cul arc late Tertiary and 
Quaternary IQTs) in age "D" designates down- 
lhrown block, "U" designates upihrown block Where 
faults are close logclher, they arc sometimes mapped 
asoFAULTZONE (see Example 15) Nole that fault 
at left juxtaposes laie Tertiary and Qualemary siraia 
wnh an exposed bedrock block of Miocene (Tm) age 
Example from sparker profile across San Diego shelf. 
Loma Sea Valley, and cast flank of Coronado Bank, 
inner southern California continental borderland. 



FAULT solid where well defined, dashed where inferred, que- 
ried where uncertain Open tnangle asinde fault symbol indi- 
cates fault does not have seafloor expression and strata cut are 
probably Miocene (Tm?) in age "D" designates downlhrown 
block; "U" designates upihrown block Nole also the two faults 
at Ihe fat nght that are designated by filled box and bar on the 
fault symbol These have scaHoor expression, and cul slrota of 
presumed Holocene age. Example from sparker profile across 
San Diego shelf to Lama Sea Valley, inner soulhem Califomis 
continental borderland 



Fault Uhrusil solid where well defined, dashed where 
inferred, quened where uncertain Barbs are shown on 
upper plate Note thai the youngeil H'a'a cut are of late 
Ternary and Qualcmary (QTs) age Example from spark- 
er profile across shelf west of Veniurt. middle southern 
California continental borderland lal" Greene and oth- 
er*, 1978, their Plate 1) 



T r 




FAULT ZONE solid where well defined, dashed where in- 
ferred, queried where uncertain Fault lonc oFTsels sedimentary 
rocks of Miocene (Tm) age and locally may extend lo ihe sea- 
floor Example from the sparker profile across shelf south of San 
Mateo Point, inner souihem California continental borderland 
(after Greene uiil Kennedy. 1481 ) 



touiTiEm CaliromiB conlintnial borderlind. 



bedrtKk ndge of folded Mioccni ilrata Ew 
iparker profile acrou nil'Nani] ihtlf near Car 
uiulhcm CalifomiB conli'Bn>«l *orJ«'l»B<l 



etland near New 



I conunenial 



'i- ij^ 1 >}t- /?^. t^o- 


^ ) 


/ 3d7[r^~~~~~~~..^^ 




1 *'*^ / ~^~~~~^ 

1 * // " / 




- C (7 . / 


'r-. 


: Tt? ^ / 




T / J / ~ 


( 

\ 


3S-- 

\ 

\ 


/ K / ' 

w / ? / 






/ 


tV 


n 




^j- 


r?^ yo- "8* \ '/6' 


32V 



16. FAULTED ANTICLINE 



17. FOLD 

(anilcllne) 



LOCATION MAP OF PROFILE EXAMPLES 

Index mop showing locaUoiuofieumic-rEncction exampla. Locaiioiuorejumplesarcapprau- 
male and the erfiion may be coniacied for more informHiion, Tlic circle and number five 
approumaie locslion of the seismic line and the line within the circle U aligned in the ume 
direclionBt Ihcuismic trackline Example I9isiepreseiiledby alinconly Examples spaced c>i»c 
togelherarcplollcd uilhin iJie same circle as one tine, i.e.. 1,10. Examples which are on Iheumc 
line hut at difTcrenl tholpointi are shown with two crossbars on the line inside (he circle, i.e. S.H 



16. FOLD 
(antlcllna. 
syncllne) 




^1500 
22S0 



FAULTED ANTICLINE Gai migrating 
upward along faults in late Tertiary and Qua- 
ternary (QTs) siraia has accumulated along 
the faulted aniiclmal crest, increasing the 
acoustic contrast Example from !-scc, sin- 
gle-channel airgun reflection record m off- 
shore Santa Mana basin, south central 
Califomia continental margin 



FOLD <aniicline)i axis shown ai solid line where well 
defined, dashed where inferred, queried where uncertain- 
Arrow indicates direction of axial plunge. Also note small 
gynclme to nght of anticline, and angular unconformity 
between undifFcrcn Mated igneous ind sedimentary rocks 
of probable Miocene age (Tmu?),»nd overlying strata of 
Miocene (Tml age Example l:om Uniboom profile 
between the Tanner and Cortes Binks, middle southern 
California continental borderland. 



5- 






1 


0- 






1 

Tm 1 Tm 

1 


s- ^ ^ 


zw 


I'-y^^ 


1 



-H 



FOLD (aniiclinc) aiis shown as solid line where well defined, dashed 
where inferred, quened where uncertain Arrow indicates direction of 
axial plunge Also note imall syncline located between the two anticlinal 
folds, and the angular unconformity between folded strata of Miocene 
(Tm) age and the progradational sequence of Miocene (Tm) sedimentary 
rocks. Example from Uniboom profile across San Nicolas Island platform. 
middle southern California coniinenial borderland 



KEY TO RECENCY OF FAULTING 
FAULTS 

Sohd where well denned, dashed where inferred, queried where uncertain. 
Barbs shown on upper plate of thruM fault. Where fault olTsels sea floor, age symbol is shown 
on bar on downthrown vide. Where age was determined, age symbol is shown astride fault and 
relative olTset is shown by "D" and "0"on downthrown and upihrown tides Ages of faults are 
indicated as follows, all faults considered active or poientiatty uclivc shown in red: 
S cuts strata of Holoccne age 
Q cuts strata of Pleiilocene age 
g cuts strata of Quaternary age 
O (ul* slrala of late Tertiary and Quflternary age 

A cuts strata of Pliocene age 
t^ cuts Miocene or older strata 

7 ^ A ; a 



23. CHANNEL 
llllledl 



24. CHANNEL 
llllleil) 



2S. CHANNEL 
(buriad) 




338- 


g 


W/W/Z/M 


tt 






S!413- 


— 






X 


-<;:7- — qT5 -' — - =- — ^^--,.;^ 




^^ -=— ^T' _ .^SSS^:^^ 


488- 




QTs '""" ■ 0T» 



CHANNEL (filled) dash-dot line marks paleochannci axis, arrow 
indicates direction ofsedimenl transport Channel margins indicat- 
ed by solid line where well defined, dashed where inferred, queried 
where uncertain Example from Uniboom profileof upper Ternary 
and Quaternary IQTs) sediments filling an erosionul channel locat- 
ed ofT Point La Jolla. inner southern California continental border- 
land. 



^^as3 






CHANNEL (filled) dash-dot line marks paleochennel axis [not located on 
profile ;4>ove). arrow indicates direction ofsedimenl transport Channel margins 
indicated by solid line where well defined, dashed where inferred, queried where 
uncertan Note that old channel deposits (QcO have been incised by subsequent 
erosion, rcsulimg in the formation of a modem, active channel Symbols. QTv 
upper Ttniary and Quaternary sediments: Tpp*", Pliocene Punsima C) Forma' 
lion Eximple from Uniboom profile across Ascension Canyon, central Califor- 
nia contrienial margin 



CHANNEL (buned) duh-dot line marks p; 
row indicates direction of sediment irsnspor 
indicated by dotted line Also note Ihechannel t 
to the left of buned channel, filled wilh undifli 
of late Ternary and QuaiemBry ((jTs) age. 
occupying the site of this older, filled channel < 
the presence of low-relief erosional warps at il 
from sparker profile aerots the Gulf of Santa 
Point, inner southern Calilorma continental b 



^^.rfS«C»i 



i?^-^^S 



30. LANDSLIDE 
(slump) 



31. LANDSLIDE 
'B'ump) 



32. LANDSLIDE 
(slump) 



. LANDSLIDE (7) 
(■lump) (7 > 



34. LANDSLIDE 
(scarps) 



19. STRUCTURAL HIGH AND LOW 



20. STRUCTURAL HIqh 



21. CHANNEL 
(active) 



22. CHANNEL 
(filled I 




^,,1J«W|I!I|||| 





KfLOMETERS 










«J=> 


^ 




QTt 


'SO- 




_ -atT^ 


j^^^l 


t^BibL[~ 


1500- 


^^^^^^M 


^^- Ts7 


/ 




2Z%0- 


i^ 









. j- 








- 




— 


~i 




—^ 






— 






-T- 
































































































^-- 




- 


, 


. 


__ 


, 










^ 










? 










=^ 


— 








^ 


















r - 

q 








25- 




li 




k' 


^ 


-0,7 




^- f'^ 




-J 


"J I 




— 














^}^ 


r 


.__ 




00- 














-0.8 




,^ 


■^ 


*^ 






i^ 


— 


'_ 


V 


1—- 


__. 


T^ 




~ 


^tr 


— 






n 
















■ -- 


-^ 


^— 


— ■ 




k- 


— 


^ 




■■ — 
























"■ 






















































. 


i.. 


„ 


_.. 





















STRUCTURAL HIGHS AND LOWS: solid whcfc well defmed. daihed 
where inferred, quened where unccnain Struclural highs formed by ihe 
Farallon Ridge ICrelaceous grannie rocks, gr, of rhc Salinian lerrane of 
Silberling and others. 1984) and Ihe Sanla Cruz high (Crelaceoussubduclion 
melange of Franciscan Complex. KJfj and ihc mrervcning struclural low 
filled by Ihe laie Tertiary and Qualcmary scdimcnls of the outer Sanla Cruz 
iwMn Line drawing from a 4-second. single-channel sparker profile run 
across Iheconlinenlalsheirand slope wcsl ofHalfMoon Bay.olTshorecenlral 
California. 



-4- 






O.S 1-0 1,S 

I I I I 

KILOMETERS 



CHANNEL (aclive) dosh-dol tine marks channel aMi. arrow indicalcs 
direcMon of sediment iransporl. Also nole Iwo buned channels beneath the 
modem sea floor of presumed Quale mary- Ternary, undifTerenliaied age to 
nght of active channels Enamplc from sparker profile acroa head of 
Arguello Canyon, off Pomt Arguello, central California conimcmal mar- 
gin 




STRUCTURAL HIGH solid where well defined, dashed where inferred, 
queried where uncerbin Top of struclural high is surface eroded onto 
presumed sedimentaiy rocks (Ts) of Tertiary age buned beneath undif- 
ferentiated sedimentary rocks and sediments (QTs) of Tertiary and Qua- 
ternary age. EnampV from sparker prolilc acrosi the Gulf of Sanla 
CsTslina. 



CHANNEL irillcd) duh-dol hne mafks palcochannel aus. 
arrow indicates direction of ledimem iranipon Channel mar- 
gins indicated by w>lid tine where well defined, dashed where 
inferred, queried where uncenain Also note faull (hat culs (lai- 
lying sediments of presumed Holoccne age and is expressed m 
Ihe seadoor Example from Uniboom profile off Point Ano 
Nuevo. central California contmenial margin 



-^- 



iZ-l'Z£ 



26. CHANNEL 

(burled) 



26. LANDSLIDE 

(creep) 



29. LANDSLIDE 

(Slump) 





KILOMETERS 



' dash-doi line marks paleochannel axis, ar- 
an of sedimtnt iranspon Channel margins 
ic Also nole ihc channel al lurfagc, above and 
hannel. filled with undilTcrenliated ledi 
Quaternary (QTs) age A modem channel 
this older, filled channel may l>e mdicaled by 
:lief erosion al warps al Ihe surface Example 
across the Gulf of Santa Caialina. olT Dana 
Califomia continental borderland. 



4 50- 


A: \U\ _ 




^-— V---_ ~ £:'! 2'yv_—=^r^ 




;f =?^ - -"l^-'^^jji^j: 


060- 






f^^-fi^^Vfr- 



CHANNEL (buned) dash-doi line marks paleo- 
channel axis (not indicated on profile above). 
Wiihm upper Tertiary and Quaternary (QTs) sedi- 
ments, the channel margins are indicated by doited 
lines Pulled-down reflccton, immediately beneath 
ihechanncland incoherent reflectors at depth prob- 
ably result from low acouslic velocities auoaaied 
with unconsolidated channel fill materials Exam- 
ple from sparker profile across the Gulf of Sanla 
Catalma, inner southern California contmenial bor- 
derland 



LEVEE solid where well defined, duhcd 
Hherc inferred, queried where uncertain 
Levees constructed from sediment overflow 
tractive submanne channel (shown as dash- 
dol line with arrow indicating direction of 
ledimenl transport) Levees of Quaternary 
Ige are deposited upon flat lying sirala of 
ledimenti and sedimentary rocks of Qualer- 
»ary and Tertiary, undilTerentiatcd. age 
(QTs) Example from sparker profile across 
door of Gulf of Santa Catalma at base of 
ilope west of San Maieo Point, southern Cali- 
fornia continental borderland. 



CREEP [noted on a imgte survey line): arrow mdicales apparent direc- 
tion of sediment movement in upper Ternary and Quaternary (QTs) 
sediments Example from Uniboom profile off Oceans id e. inner southern 
California conlinental borderland 



SLUMP boundanes solid where well defined, dashed where 
inferred, queried where uncertain Arrows indicate direction of 
movement Zone of movement extends to a subboiiom depth of 
approximately 20 m Note hummocky seaHoor surface and back- 
rt)taied subboiiom refleciore (slip surface) Example from Uni- 
boom profile across contmenial slope off Crescent City, northern 
Califomia continental margin 



4NDSL(0E 

carps) 



35. LANDSLIDE 
(block glide) 



36. LANDSLIDE 
(block glide) 



37. LANDSLIDE 
(sediment flow) 



38. QAS 

(seep) 
375-| 



3. LANDSLIDE <7) 
(tlumpX?) 




34. LANDSLIDE 
(scarps) 



**^'*^^W;! 









-,-: 




1 

Sfii 




0.05 










g 4SO- , , ^ 
0.10O 


^':& ^B 


1 


"'" % 




■ -'^n 


0.20 

600- 


ss^l^ 


■ 


675- 


: 


! 



SLIIMP boundano wMd where *cll dcHncd. diihed whcfe infefted, queried 

where unccrlain Arrowt indiL-alc dtreclion oS movemeni Zone or 

eilends to 3 subbollom depth of JO m Noie hummocliy «afl«>r surface, ilip 

surfsco and back rotation of renecton wilhin moving Kdimi 

from Unibootn profile acnn» ilope wcsl-nonhwni of Cmcertt Cily. r)Dnhem 

CaliromiB coniinenlal murgin ufier Field and others I9B0. iheir Figure IS) 



1 


.,^- 




^ 


^^s>s^^^--^^ ~ 


















~~"^^^^^^^= -""IT — -^^^i^^^?^ 


--,,.,^ 




55->-^ 












— ^ 















SLUMP boundaries solid where well defined, dashed where 
inftfTed, quened where oneenain Arrows indieaie di reel ion 
of rnovemenl Zone of movement extends lo a tubboltom 
depth of in excess of 100 m involving sediments of lale Terti- 
an, and Qua ternary (QTs) age Note slip surfaces and appsf- 
eni drag folding of strata adjacent to slip iurfaces Example 
from Umboom profile near [-a Jolla Canyon, inner souihem 
California continental borderland. 



SLUMP boundaries solid where well dcrincd. dashed where inferred, 
quened where uncertain Arrows indicate direction of movemtnl Zoneof 
movement extends to a subbotiom depth of approximately °0 m in sedi' 
ments of lale Tertiary and Quutcmary (QTsl age Note apparent slip 
surfaces and back-rotated reflectors Example from Unboom profile 
across Ascension Canyon, central Califomia cotttmenlal lutgm. 



SLUMP bnundnnes solid where well dcrined. dashed where inferred, 
quened where uncermm Arrows indicate apparent direction of move- 
deposits oriaic Tertiary and Quaternary (QTs) age Movemeni 
of the slump mass along a generally arcuate failure surface has de- 
stroyed the bedding and produced a nonrcflccling tone Example from 
Umboom profile across the continental slope ofT outer Santa Cruz basin, 
central California continental margin 





GAS area of acoustic anomaly possibl> indicating the prcsenic of gas- 
saturated sediments. Solid where well defined dashed where inferred 
quened where uncenam AiouMit anomalies above occur in flat lying 
Quaternary (Q) sediment overlying an eroded flat lopped Miocene 
(Tm) ticdrock ndge Example from Unihoom profile across San Pedro 
escarpment and ihelf. middle uiulhem California continental borderland 



GAS: area of acouslit anomaly, possibly indicating the presence of 
gas-saturated sediment Solid where well defined, dashed where 
inferred, quened where uncertain. Example from Umboom profile 
acrossshelfandupper slope west of Crescent City, northern Califor- 
nia continental margin. 



SCARPS houndanes solid whe 
quened where unt 
movement invalves sediment ofl 
age. Note double hachurts ind{ 
Uniboom profile across La Jol| 
i»)nlinental borderland. 








GAS area of acoustic anomaly, possibly indicating the presence of gas saturated 
sediment Solid where w^ll defined, dashed where inferred, quened where uncertain 
Example from ) 5 kHi profile ocross shelf off Crocent City, riorthem Califomio 
continental margin 







DIAPIRIC RIDGE Solid where well defined, dashed where inferred, 
quened where uncertain Shale-cored diapir pierces upper Ternary and 
Quaternary (QTs) strata and extends above the seafloor Example from 
.1 S kHi profile across marginal plateau west-northwest of Eureka, north- 
ern California continental margin 



•US Geological Survey 
"California Deparimcm of Conservation. Diviii 
Scripps Insiiiuiion of Oceanography 



D of Mines and Geology. 



MASTER LEGEND AND EXAMPLE 
PROFILES WITH SYMBOLS A] 

H. GARY GREENE* AND MICHAEL P. I 



^^/V^-^I 




37. LANOSLIOE 
(sadlmcnt flow) 



S boundjnts m-IiJ where well defined, diuhcd where inferred, 
where unieriBin Hachutes mditaic slump scarp Zone of 
nf involvi^ icdimcnl of late Ternary and Qualernary (QTs) 
tc double hathurCT indicaic eroiional wnrpi Eumpk from 
n profile jtri»t La Jolla Canyon, inner voulhcm California 
Inl borderland 



BLOCK GLIDE boundsnes wlid where well defined, disM where 
inferred, quened where uncertain Arrows indicate apparenl diieclion of 
movemeni Zone of movemcnl e«iends lo a subbotlom depth rf 150-190 
m. involving udimcnts of laie Ter1iaf> and Qualemar> (OTs) tge Noie 
relative acouslic transparency of blocks, possibly the result of in 
deformalion of strata within the blocks Erosional channelt maj develop 
locally along pull-apan fracture* between blocks, shown by doolie hac- 
hurc* (erosional scarp) Example from sparker profile across base ofslope 
off Newport Beach, inner southern California continental bordcrla»d (aft- 
e and others I98J. their Figure MO) 



BLOCK GLIDE, boundancs sohd wher 
dashed where inferred, quened where u 
rows indicate apparenl direction of movemeni Zone of 
movement extends lo a subbotiom depth of approxi- 
mately 90-100 m. involving sediments of laie Tertiary 
and Quaternary IQTs) age Note that internal defor- 
mation of blocks IS greatest toward the from edge 
(downslopc). and sole (basel of the mass. Locally 
erosional channels may develop along pull-apan frac- 
tures between the blocks These are shown with double 
hachures (erosional scarp) Example from mini-spark- 
er profile across slope south of Newport Beach, inner 
southern California continental borderland 




SEDIMENT FLOW Boundaries solid where well defined, dashed 
where inferred, quened where uncertain Arrows indicate direction 
of movemeni in sediments of late Tertury jnd Quaiemiiry (QTs) 
age Note multiple headscarps above thick, detached sediment mass, 
acoustic transparency of this mass, and absence of an identifiable 
slip surface Enample from Uniboom profile across north slope of 
Santa Barbara Channel, (approwmaiely JS 1 
bara (from Edwards, 1982) 



f:i.%y;-Jv) 



) west of Santa Bar- 



OIL AND/OR GAS SEEP vymbol indicates presence 
of subbotiom and water column acoustic anomalies 
associated with gass.rps Gasscepoccun in sediments 
of late Ternary and Quaternary (QTs) age Queried 
where uncertain E.iamplc from Uniboom profile 
across base of slope off Point La Jolla, inner southern 
Cahfomia continental borderland (after Greene and 
others, 1983, their Figure 2-16) 



44. TERRACE 

(constructional) 



45. TERRACE 
(erosional) 



46. TERRACE 

(aroslonal) 



f^ 



!S 





DIAPIRIC RIDGE Solid where well defined, da^thed where 
inferred, quened where uncertain Shale<orcd diapir pierces 
upper Ternary and Quaternary IQTs) and older strata and 
extends above the seaFlocr Example from sparker pronte 
across margmal plateau wcst-northwesl of Eureka, northern 
California continental margin. 




TERRACE (constructionjll Ewmple from Uniboom profile 
across east flank of Cones Bank, middle wuthern California conti- 
nental borderland, showing Pleistocene (QTl pt.^gradational ter- 
race sequences forming a caistructionjl <" dep.>sitionul manne 
(errace (after Greene and oilier*. lOlJ. their Figure 5) 




TERRACE (ermionall Example from Uniboom profile atr 
off Point La Jolla. inner southern California continental borderland 
Undifferentiaied. folded Cretaceous strata (Kul and overlying upper 
Ternary and Quaternary (QTs) progredai tonal M^uence have bccti 
bevelled by wave action Acoustically trantparant unit overlying *•*<• 
cut platform is probably Holocene <Q) in age 




TERRACE (erosional! Wave-planed, platform composed of undifferentiated. 
folded Cretace«u» ( Ku) strata, forming a wave-cut terrace, parnally overlain by 
acoustically rraniparani layer of Holocene (Ql age Example from Unibootn 
profile across thelf off Point La Jolla. inner southern California continental 
borderland (after Greene and others, 198), their Figure 2-18) 



EXAMPLE SEISMIC REFLECTION 
MBOLS AND TERMINOLOGY. 

) MICHAEL P. KENNEDY**, EDITORS 



DIVISION OF MINES AND GEOLOGY 
JAMES F DAVIS, STATE GEOLOGIST 



STATE OF CALIFORNIA-GEORGE DEUKMEJIAN , GOVERNOR 

THE RESOURCES AGENCr- GORDON K VAN VLECK, SECRETARY FOR RESOURCES 
DEPARTMENT OF CONSERVATION - DON L BLUBAUGH, DIRECTOR 



1908 




MAP A: Foults shown on the first fault mop of California, From Mop No. I of the Stoto Eorlhquahe Investigotron Commission 
report on the Californio eoflhquoke of April 18, 1906 (Lowsor>, and others, 1908), Fault nomes shown in quotation 
merits ore from tent of 1908 report; other fogit names were added from current usage. 



1916 




MAP e, H.O. Wood'! (19161 abridg.d v.riion o) lowioni 1908 (oull mop of Colifornio, ihowmg loulii or.d "lines- tentotiv.ly 
considered by Wood lo be generatrices of eorthquokes. 



EXPLANATION 



San Andreas rauit 

a) Punta Gorda-foinl Arena segment 

b) Pan) Arena-San Juan segment 
C| San Juan-Te|on sogmoni 

d) Teion-CoiOfaOo segmeni 

Cureka-Uiuah-San Pablo hne 

MounI 5L Helens faun 

Swsun fault (now c«Ilsd Green Valley fault) 

Mare isiarxi-Nevsda-Carson line 

Ha ywards fault mo* Haifward laud) 

Sunol fault system (also known as Calaweras t« 

San Gtegono fault 

Monleiey submanne fauH-iono 

Pataro faufi 

Groal Valley ana 

a) Shasta -Stockton sag mem 

b) Stockton- Tofucfiapi ^egmont 
Honey lake taoll-ione 

jmbw*d. but M*fltifi«d. laulti br Woods Klomoiti Loha 



13. Swrra lault system 

a) Beckwitti-Mono segment 
D) Mono-Tejoo tegmenl 

14. sonlB Luoa lautl 
Lockwood fault 

15. Templaton fault 

lt San Un Obnpo 'aull (now part of Nacmuento faurt-z< 
17 Kern fault (now Kem Canyon faulll 
te Santa Vnez fault 

19 San Gabnel tault 

20 Santa Monica fault 

2^ San Pedro submanne fault -iotm 
22 WNttw fault 

23. Santa Ana tault 

24. Elvnore fault 
Agu* Callenle fault 

hJortti. and South Canio l«*ct fault 
25 San j«£ttilo fault 



iihwll liho-W^ *•<>' 



■( Mounloint foulll, Bed* toutt. 



Fault and Geologic Data Maps of CoMfornia 
BULLETIN 201, PLATE I 



1922 



ucc 



EXPLANATION 



1. Burden Mtn. F. 

2. ChJco monocline F. 

3. Chino F 

4. Coyote Creek F 

5. Cristianitos F, 

6. Cucamonga F 

7. Dry Creek fault 

8. Faults in Anderson Valley and Navarro R, 

9. Fault (n Capay Valley 

10. Fault al Diablo Canyon 

11. Fault by Dunnigan Hills 

12. Fault in Palm Canyon 

13. Fault along San Antonio Creek 

14. Fault at San Simeon 

15. Fault on W. side Panaminl Va. 

16. Faull on W. side Saline Va. 
17 Johnson Va. F. 

18- Kern Gorge F 

19. Liebre-Clean*ater F 

20. bttle Pine F 

21. No. Branch San Andreas F. 

22. Oakndge-Santa Susana F 

23. Old Womar> Spnngs F, 

24. Palos Verdes F 

25. Pipes Canyon F 

26 Rinconada F 

27 Rogers Creek'Healdsburg F. 

28 San Fernando F, 

29 San Francisqulto F. 

30. San Gabnel F, 

31. San Gabriel F, 

32. Sien-a Madre F, 

33- Tolay F 

34- Tularcitos F, 




LEGEND 



ACTIVE FAULT, well located 
ACTIVE FAULT, uncertainly located 
PROBABLY ACTIVE FAULT 
DEAD FAULT, well located 
DEAD FAULT, uncertainly located 
PROBABLE FAULT, localionand 
character uncertain 



MAP C: Faults shown on the Fault Map of California compiled by B. Willis and H.O. Wood and published by the Seis- 
mologicol Society of America in 1922 at a scale of 1:506,880. Faults were not shown by nome on the original 
map, but have been identified on this plote. 



1947 




LEGEND 

MAJOR FAULTS, well located 
MAJOR FAULTS, approximately located 
OTHER FAULTS, well located 
OTHER FAULTS, approximately located 
FAULT LOCATION, uncertain 



MAP E: Foult map of southern California (here slightly generalized) compiled by H.O. Wood. Faults wetp taken largely from 
the 1922 Fault Mop of California and the 1938 Geologic Mop of California. This foult mop (with epicenters) was 
published in the Bulletin of Seismological Society of America, July 1947. 



1938 



Faults of Lake Tahoe graben (Lindgren, 1887, USGS Folio) 

Concord 

Coasi Ridge 

Rinconada (part) 

Nacimrenio 

Owens Valley (v mcomp'ele - only pari that broke at Lone Pme) 

Sietra Nevada (v incomplele) 

San Gabriel (disappearing under Frazier thrusi) 

Clearwaler 

Arroyo Panda (part) 

San Cayelano 

San Gabnel (eastern end) 

Sierra Madre 

Raymond 

Cucamonga 

Newpon-lnglewood 

Rose Canyon 




MAP D: Faults shown on the Geologic Mop of California published in 1938 ot 1:500,000 scale. This reduced version, showing 
faults only, includes oil those faults shown on the larger scale mop, Foults were not shown by name on the original 
map, but have been identified on this plate. 



yM 



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