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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
0
"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
0
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
0 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
0
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
0
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)
0
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
0 ^
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
0
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
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
0
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
0
10
_J
20
—I
KILOMETERS
2250
QTs
gr
-0
-1
-2
-3
CO
Q
z
O
o
UJ
CO
0
~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'
0 5
0
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*^
0
i_
0 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
0
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-Tri.-ti'.-'ji [..■gQiys ■■!!-. vsrrriKTHsrrz
--.-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
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
0 —
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
0 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
•*
0
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
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
0
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)
0
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
0 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
0
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:'ii^)a!.m: ;y:;t- ;- ; ■ ly-r '■.^■'jri ~ ^m9^»'^f.lm^fn■:"'^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 0
100 ZOOMiles
1 100 0
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 * 0 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 « 0 « 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-
_^~ -~^.
_-!_'_
0 0 o
0 o"o tt
-TT 5~B a
o
i O OOOo
in
c^a ooo<
Oligocene
0 o o a oc
^~
0 O 0O 004
4 0 ©•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 0 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 0 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
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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-
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V. 170, p. 974-977.
Allen, C.R., St. Amond, P., Richter, C.F., ond Nordquist, J.M., 1965,
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Alpha, T.R., 1970, Physiographic diagrams of ports of the continen-
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Alpha, T.R., 1972, Physiographic diagrams for Venturo-Oxnard off-
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Alpho, T.R., Dingier, J.R., Jones, D.R., Molion, D.E., Peterson, DC,
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depth, and mainland versus offshore relationships, southern Cali-
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Anderholt, R., and Reed, W.E., 1978, Organic corbon and texture
of benthic and intertidol sediments, southern California continen-
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Anderson, D.L., 1971, The Son Andreas fault: Scientific Americon,
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74
DIVISION OF MINES AND GEOLOGY
BULLETIN 207
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of Petroleum Geologists Memorandum 25, p. 313-317.
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.
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Wilde, P., Normark, W R., and Chose, T.E., 1980, Potentiol petro
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guide to the geology and oil fields of the los Angeles ond
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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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hiL/^^;!:"'"""^'^ °' California, dav.s
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UNIVEHSITV OF CALIf
3 1175 02103 8065
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IJJ
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1.6
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- -_.
1500-
0.4
0.8
COLLATE :
^ PIECES
9U
m
H
II
ui
81
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s
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-
0 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;!
0
-,-:
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
^