STATE OF ILLINOIS

DWIGHT H. GREEN, Governor

DEPARTMENT OF REGISTRATION AND EDUCATION

FRANK G. THOMPSON, Director

DIVISION OF THE

STATE GEOLOGICAL SURVEY

M. M. LEIGHTON, Chief
URBANA

REPORT OF INVESTIGATIONS— NO. 122

UPPER KINKAID (MISSISSIPPIAN) MICROFAUNA
FROM JOHNSON COUNTY, ILLINOIS

BY

CHALMER L. COOPER

Reprinted from the Journal of Paleontology,
Vol. 21, No. 2, March, 1947

PRINTED BY AUTHORITY OF THE STATE OF ILLINOIS

URBANA, ILLINOIS
1947

ORGANIZATION

STATE OF ILLINOIS

HON. DWIGHT H. GREEN, Governor

DEPARTMENT OF REGISTRATION AND EDUCATION

HON. FRANK G. THOMPSON, Diiector

BOARD OF NATURAL RESOURCES AND CONSERVATION

HON. FRANK G. THOMPSON, Chairman
W. H. NEWHOUSE, Ph.D.. Geology
ROGER ADAMS, Ph.D., D.Sc, Chemistry
LOUIS R. HOWSON, C.E., Engineering
CARL G. HARTMAN, Ph.D., Diolooy
LEWIS H. TIFFANY, Ph.D., Forestry

GEORGE D. STODDARD, Ph.D., Litt.D., LL.D., L.H.D.
President of the University of Illinois

GEOLOGICAL SURVEY DIVISION

M. M. LEIGHTON. Chief

SCIENTIFIC AND TECHNICAL STAFF OF THE
STATE GEOLOGICAL SURVEY DIVISION

100 Natural Resources Building, Urbana

M. M. LEIGHTON, Ph.D., Chief

Enid Townley, M.S., Assistant to the Chief Helen E. McMorris^ Secretary to the Chief

Velda A. Millard, Junior Asst. to the Chief Effie Hetishee, B.S., Geological Assistant

GEOLOGICAL RESOURCES

Petrographer and Principal

Ralph E. Grim, Ph.D.
Geologist in Charge

Coal

G. H. Cady, Ph.D., Senior Geologist and Head
R. J. Helfinstine, M.S., Mech. Engineer
Rolf W. Roley, B.S., Asst. Mining Engineer
Robert M. Kosanke, M.A., Asst. Geologist
John A. Harrison, B.S., Asst. Geologist
Jack A. Simon, B.A., Asst. Geologist
Arnold Eddings, B.A., Asst. Geologist
Mary E. Barnes, B.S., Research Assistant
Margaret Parker, B.S., Research Assistant
Walter E. Cooper, Technical Assistant
Florence Honea, B.F.A., Technical Assistant

Oil and Gas

A. H. Bell, Ph.D., Geologist and Head
Frederick Squires, B.S., Petroleum Engineer
David H. Swann, Ph.D., Assoc. Geologist
Virginia Kline, Ph.D., Assoc. Geologist
Paul G. Luckhardt, M.S., Asst. Geologist
Wayne F. Meents, Asst. Geologist
Richard J. Cassin, B.S., Research Assistant
Nancy McDurmitt, B.S., Research Assistant

Industrial Minerals

J. E. Lamar, B.S., Geologist and Head
Robert M. Grogan, Ph.D., Assoc. Geologist
Raymond S. Siirode, B.S., Research Assistant

Clay Resources and Clay Mineral Technology

Ralph E. Grim, Ph.D., Petrographer and Head
Henry M. Putman, B.A.Sc, Asst. Geologist
William A. White, B.S., Research Assistant

Groundwater Geology and Geophysical
Exploration

Carl A. Bays, Ph.D., Geologist and Engineer, and

Head
Robert R. Storm, A.B., Assoc. Geologist
Arnold C. Mason, B.S., Assoc. Geologist

(on leave)
Merlyn B. Buhle, M.S., Assoc. Geologist
M. W. Pullen, Jr., M.S., Asst. Geologist
Gordon W. Prescott, B.S., Asst. Geologist
Margaret J. Castle, Asst. Geologic Draftsman
Robert N. M. Urash, B.S., Research Assistant
George H. Davis, B.S., Research Assistant

(on leave)

Engineering Geology and Topographic
Mapping

George E. Ekblaw, Ph.D.
Richard F. Fisher, M.S.,

Geologist and Head
Asst. Geologist

Areal Geology and Paleontology

H. B. Willman, Ph.D., Geologist and Head
Heinz A. Lowenstam, Ph.D., Assoc. Geologist
J. S. Templeton, Ph.D., Assoc. Geologist
Donald Saxby, M.S., Research Assistant

Subsurface Geology

L. E. Workman, M.S., Geologist and Head
Elwood Atherton, Ph.D., Asst. Geologist
Paul Herbert, Jr., B.S., Asst. Geologist
Marvin P. Meyer, M.S., Asst. Geologist

Physics

R. J. Piersol, Ph.D.

Mineral Resource Records
Vivian Gordon, Head

Ruth R. Warden, B.S., Research Assistant
Dorothy F. Spencer, B.S., Technical Assistant
Mary Burnett, Technical Assistant
Susan M. Tull, B.A., Technical Assistant
Meta L. Pilgrim, Technical Assistant
Harriet C. Daniels, B.A., Technical Assistant

GEOCHEMISTRY

Frank H. Reed, Ph.D., Chief Chemist
Grace C. Johnson, B.S., Research Assistant

Coal

G. R. Yohe, Ph.D., Chemist and Head
Eva O. Blodgett, B.S., Research Assistant

Industrial Minerals

J. S. Machin, Ph.D., Chemist and Head
Tin Boo Yee, M.S., Research Assistant
Paulene Ekman, B.A., Research Assistant

Fluorspar

G. C. Finger, Ph.D., Chemist and Head

Oren F. Williams, B.Engr., Special Research

Assistant Chemist
Lewis E. Moncrief, B.S., Research Assistant
Horst G. Schneider, B.S., Special Research Asst.

Chemical Engineering
H W. Jackman, M.S.E., Chemical Engineer and

Head . , ^ .

P. W. Henline, M.S., Assoc. Chemical Engineer
B. J. Greenwood, B.S., Mechanical Engineer
James C. McCullough, Research Associate
James H. Hanes, B.S., Research Assistant

(on leave)
Earl C. Noble, Technical Assistant

X-ray and Spectrography
W. F. Bradley, Ph.D., Chemist and Head

Analytical Chemistry

O. W. Rees, Ph.D., Chemist and Head
L. D. McVicker, B.S., Chemist
Howard S. Clark, A.B., Assoc. Chemist
John C. Gogley, B.S., Research Assistant
Emile D. PieRRON, B.S., Research Assistant
Elizabeth Bartz, A.B., Research Assistant
Albertine Krohn, B.S., Research Assistant
Gloria J. Gilkey, B.S., Research Assistant^
Annabelle G. Elliott, B.S., Technical Assistant

\\.

MINERAL ECONOMICS

H. Voskuil, Ph.D., Mineral Economist

Physicist Emeritus

Douglas F. Stevens, M.E., Research Associate
Nina Hamrick, A.B., Research Assistant
Ethel M. King, Research Assistant

EDUCATIONAL EXTENSION

Gilbert O. Raasch, Ph.D., Assoc. Geologist
Georgia B. Meredith, B.S., Technical Assistant

LIBRARY

Regina Yoast, B.A., B.L.S., Librarian
Ruby D. Frison, Technical Assistant

PUBLICATIONS

Dorothy E. Rose, B.S., Technical Editor
M. Elizabeth Staaks, B.S., Assistant Editor
Meredith M. Calkins, Geologic Draftsman
Beverly Scotton, Assistant Geologic Draftsman
Willis L. Busch, Principal Technical Assistant
Leslie D. Vaughan, Assistant Photographer
Beulah M. Unfer, Technical Assistant

Consultants: Ceramics, Cullen W. Parmelee, M.S., D.Sc, and Ralph K. Hursh, B.S., University of Illinois

Mechanical Engineering, Seichi Konzo, M.S., University of Illinois
Topographic Mapping in Cooperation with the United States Geological Survey.
This report is a contribution of the Division of Areal Geology and Paleontology.

March 15, 1947

Digitized by the Internet Archive

in 2012 with funding from

University of Illinois Urbana-Champaign

http://archive.org/details/upperkinkaidmiss122coop

UPPER KINKAID (MISSISSIPPIAN) MICROFAUNA
FROM JOHNSON COUNTY, ILLINOIS

CHALMER L. COOPER
U. S. Geological Survey

Abstract — In northwestern Johnson County, Illinois, the Wayside formation
(Lower Pennsylvanian) rests with apparently slight disconformity upon the Kinkaid
formation (upper Chester). An important and varied microfauna, consisting of
Foraminifera, ostracodes, and conodonts is described and compared with Morrow
microfaunas from the Midcontinent and other areas. The Foraminifera include the
genera Endothyra, Glomospira, Hyperammina, Palaeotextularia, Trepeilopsis, and
Millerella. The last is specifically described from the Mississippian for the first
time. Five genera of conodonts and 20 genera (35 species) of ostracodes are included
in the fauna.

THIS paper presents the microfauna from
beds that are thought to be the youngest
Chester in the area regarded as the type for
the Mississippian system, where these beds
could be examined and studied in relation to
the superjacent Pennsylvanian. The type
area for the Kinkaid formation is located
along Kinkaid Creek, which cuts through
the formation in NW. £ sec. 6, T. 8 S., R.
4 W., Jackson County, Illinois. This is less
than 15 miles southeast of the town of
Chester and the locality from which the
fauna in question was collected is about 40
miles southeast of Chester. All known out-
crops of the Kinkaid in southern Illinois
that might show the contact with the over-
lying Pennsylvanian were visited in order
to obtain as much data as possible on the
contact relations of the Pennsylvanian-
Mississippian boundary. The best section
observed is that exposed on a north tribu-
tary of Lick Creek, which flows southeast
across sec. 31, T. 11 S., R. 2 E., crossing the

upper Kinkaid boundary in the northwest
quarter of the section. This outcrop was
described in detail by Lamar (1925, p. 80)
who measured about 30 feet of Pottsville
(Wayside) overlying 91 feet of the Kinkaid
formation, the latter containing about one-
third shale and two-thirds limestone. The
details of the contact relations, modified
somewhat from Lamar's subdivisions, are
shown in figure 1.

A coral fauna from these beds was de-
scribed by Easton (1945) who correlates
the Kinkaid beds containing Kinkadia
trigonalis, Triplophyllites palmatus, and
Caninostrotion variabilis with the upper part
of the Pitkin formation of western Arkansas.
These corals were obtained from the mas-
sive limestone at the base of the section
(fig. 1) and the thin limestones a short
distance above it (between samples 2 and
5). Concerning the coral fauna he concluded
(p. 384):
. . . the geographic distribution of the corals

81

82

CHALMER L. COOPER

Sandstone, Massive to Irregular bedded, fine to
medium grained.

Shale, black, laminated to flaky.
micaceous

Sandstone, irregular bedded, fine
white to greenish-bro'

Shale, calcareous, fossiliferous (upper 2-3'
_i silty, micaceous).

Limestone, thin bedded, lenticular, fossi

- 4

Shale, gr<y, calcareous, fossiliferous

Limestone, thin, irregularly bedded, fossi

- 2 thin shale partings

••-Shale, gray, poorly exposed.

Limestone, gray, massive, fossiliferous

Fig. 1 — Mississippian-Pennsylvanian contact in
Johnson County, Illinois. The arrows to the
right of the column show the approximate
position of samples collected for study. The
beds were sampled so that all zones from the
top of the massive limestone at the bottom
of the column to the base of the Lick Creek
sandstone were collected.

shows that the two basins (Arkansas and Illinois)
were connected and that favorable ecologic con-
ditions of unknown duration enabled faunal mi-
gration of some distinctive organisms.

All zones in the Kinkaid shales above the
massive limestone shown at the base of the
column in figure 1 contain a microfauna in
varying amounts, principally ostracodes.
However, the samples above and below the
upper thin irregularly bedded limestone
proved to be the most fruitful, zone 5
furnishing the fusulines which are described
later. The Wayside shales above the
Kinkaid are barren of fossils.

A short time ago the very primitive, short
axis fusuline, Millerella, was described by
Thompson (1942, p. 404). The holotype
came from the type locality of the Marble
Falls formation in Burnet County, Texas,
and the paratypes were collected from the
"Bend" series in the Hueco Mountains of

Explanation of Plate 19

Figs. 1-5 — Millerella Chester ensis Cooper, n. sp. 1, 4, Saggital sections with endothyroid juvenaria*
and irregular coiling as shown by the elongate volution and lack of continuity of the tunnel
in the plane of the section, X100. 2, 3, Axial sections, showing modified hour-glass outline,
X100. 5, Enlargement of 1 to show details of coiling of first volution in a plane at right
angles to the plane of the section, X200. Kinkaid forma'tion, bed 5, Johnson County, Illi-
nois, (p. 85)
6-8 — Millerella zelleri Cooper, n. sp. 6, 8, Sagittal sections showing uniformity of coiling and
tunnel, the latter lying almost wholly in the plane of the section, X100. 7, Axial section,
X100. Kinkaid formation, bed 5, Johnson County, Illinois. (p. 86)

9, 11 — Millerella kinkaidensis Cooper, n. sp. Sagittal and axial sections, the latter showing the

relatively long axis and modified keel-like margin, X 100. Kinkaid formation, bed 5, Johnson
County, Illinois. (p. 86)

10, 12 — Millerella sp. External views of two specimens, X60. (p. 83)
13 — Millerella cf. M. pinguis Thompson. Sagittal section, X100. Dornick Hills group, sec. 12,

T. 3 S., R. 2 E., Carter County, Oklahoma. # (p. 83)

14-15 — Millerella marblensis Thompson. Sagittal and axial sections, X100. Same horizon and

locality as fig. 13. (p. 83)

16-17 — Millerella advena Thompson. Sagittal and axial sections, the latter showing inflated

character and eccentric coiling of early volution, X 100. Lower Dornick Hills group, NW. \,

NW. i NE. i, sec. 16, T. 6 S., R. 2 E., Carter County, Oklahoma. _ (p. 83)

18 — Millerella inflecta Thompson. Sagittal section from the Belden formation, bed 15, section

P-15, Sweetwater Creek. Near Glenwood Springs, Colorado, X100. (Thompson, 1945,

p. 44, pi. l,fig. 5.) (p. 83)

Journal of Paleontology, Vol. 2 1

Plate 19

Cooper, Carboniferous Miller ella

Journal of Paleontology, Vol. 21

Plate 20

Cooper, Chester Conodonts and Foraminifera

MICRO FA UNA FROM JOHNSON COUNTY, ILLINOIS

83

Texas and the Mud Springs Mountains in
central New Mexico. Later, Thompson
(1944, p. 420) discovered the genotype
species, M. marblensis, in the Brentwood
limestone at the well-known type section
of the Morrow group in northwestern
Arkansas, and defined the zone of Millerella
as that part of the stratigraphic section con-
taining this fusuline to the exclusion of the
normal long-axis forms. He also stated that

It is entirely possible, if not probable, that spe-
cies of Millerella or of a closely allied ancestral
genus of fusulinids will be found in rocks of Mis-
sissippian age.

Later (1945, p. 42) he stated that

All fusulinids so far discovered in the Belden
formation (Idaho) are referable to the genus Mil-
lerella, which was originally described from the
upper part of the Marble Falls limestone of
Texas. Congeneric species are known to occur
stratigraphically from near the base of the Mor-
rowan series to near the top of the Pennsylvanian
system. It is probable that further study will
demonstrate the occurrence of Millerella in rocks
older than Morrowan.

Endothyra has long been considered by
some as the progenitor of the fusulinids
(Galloway, 1933, pp. 388, 393; Dunbar and
Henbest, 1942, p. 52) but most fusuline
students have considered that the true
Fusulinidae were confined to the Penn-

sylvanian and Permian. However, the
recognition of Millerella in zones of the
upper Chester in the type area demonstrates
conclusively the occurrence of true fusulines
in Mississippian rocks as Thompson pre-
dicted.

The thin sections of Chester Millerella
were shown to Dr. Thompson at the Pitts-
burgh meeting of the Geological Society of
America, and they were later sent to him for
direct comparison with his described mate-
rial. He states that "I have compared the
specimens you sent me with all other similar
forms I have in the laboratory. So far as I
can tell they are more closely similar to the
types of Millerella inflecta from the Belden
formation of northwest Colorado."1

There are, however, some important and
easily recognized differences between the
Chester forms (pi. 19, figs. 1-12) and those
previously described (pi. 19, figs. 13-18), con-
sequently the older forms are described as
new species. These distinguishing features
are as follows:

1. The very strongly rounded periphery.

2. The relatively short, straight septa rapidly
widening near the outer wall and producing a
structure which is A-shaped in cross section
(see sagittal sections), in contrast to the thin,

1 Personal communication, January 27, 1946

Explanation of Plate 20

Figs. 1-3 — Prioniodus scitulus Branson and Mehl. Lateral views, X20. (p. 92)

4-10 — Cavusgnathus cristata Branson and Mehl. Oral, aboral, and lateral views; 4-6, 8-10, X20;
7, X30. (p. 91)

11-13— Hindeodella sp. Lateral views; 11, X20; 12, 13, X30. (p. 91)

14-16 — Taphrognathus varians Branson and Mehl. Oral, lateral and aboral views, X30. (p. 92)
17 — Ligonodina cf. L. levis Branson and Mehl. Lateral view, X30. (p. 91)

18 — Glomospira disca Cooper, n. sp. Lateral view of holotype, X60. (p. 87)

19-23 — Endothyra excentralis Cooper, n. sp. 19, 21, Lateral views and 20, aperatural view of a
young specimen; 22, lateral view of holotype showing involute right side and greatly en-
larged final chamber; 23, apertural view of holotype. X60. (p. 88)
24, 30 — Endothyra acuta Cooper, n. sp. Lateral views, X60. 24, Holotype, showing umbilicus,
depressed sutures, and sharply curved outer margin of chambers, bed 5. 30, Smaller speci-
men showing highly arched aperture, bed 4. (p. 88)
25-27 — Hyper ammina cf. elongata clavulata Howchin. Lateral views of three fragmentary speci-
mens, X60. (p. 88)
28, 29 — Hyper ammina sp. Lateral views, X60. (p. 89)
31, 32 — Palaeotextularia asper Cooper, n. sp. Lateral views, X60. 31, Holotype. (p. 89)
33 — Hyperammina cf . H. glabra Cushman and Waters. Lateral view of a nearly complete speci-
men, with initial chamber, X50. (p. 89)
34-41 — Trepeilopsis mississippiana Cooper, n. sp., Lateral views, X60. 36, 39, 41, Specimens
showing tube bent back over earlier whorls; 38, specimen coiled about a Productus spine;
37, regular coils without development of straight portion. 34, 35, from bed 1 ; 36, 38, 40, 41,
beds 5, 6; 37, bed 7; and 39, bed 4. 40, 41, Two views of the holotype, showing wide, flaring
aperture. 34, 35, Two views of a single specimen. (p. 87)

84

CHALMER L. COOPER

more strongly curved septa of Pennsylvania n
species.

3. The eccentricity of coiling, particularly in ear-
lier volutions.

4. The modified hour-glass shape as visible in
axial sections and the variation in degree of
concavity of the two sides.

5. The endothyroid juvenarium of some species.

Based upon differences of size of prolocu-
lum, height of volutions, form ratio, and
septal count, three new species are recog-
nized in the Kinkaid fauna, namely M.
chesterensis (pi. 19, figs. 1-5), M. zelleri (pi.
19, figs. 6-8) and M. kinkaidensis (pi. 19,
figs. 9, 11). In general the Chester species
are intermediate in form between the two
extremes from the Pennsylvanian, namely,
M. marblensis and M. adrena (see sagittal
sections), having thicker shells than the
former and lacking the inflated umbilical
area of the latter. While the number of
chambers per volution are about the same,
the shorter, thicker septa of the Mississip-
pian forms result in proportionally smaller
chambers.

Millerella (species undescribed) from the
Pitkin (upper Chester) of Arkansas has been
reported by Henbest (1946). Representa-
tives of the genus are also known to occur
with Chester species of Archimedes and
trilobites in beds of the Amsden formation
in Wyoming (Zellef, 1946, personal com-
munication).

In addition to the fusulines several genera
of smaller Foraminifera are present in the
Kinkaid microfauna (pi. 20, figs. 23-26).
There are two new species of Endothyra, one
of which, E. acuta, is suggestive of E.
whitesidei Galloway and Ryniker, known
heretofore from the Atoka of Oklahoma and
the Marble Falls of Texas. The other is
similar to E. media Waters, E. rothrocki
Harlton and E. distenta H. J. Plummer, from
horizons in Oklahoma and Texas well above
the Morrow zone and considerably younger
than the Kinkaid. The flattened cylindrical
forms with the irregularly spaced constric-
tions marking successive chambers closely
resemble those from the Johns Valley shale
of Oklahoma described as Hyperammina
elongata clavatula Howchin by Harlton
(1933, p. 8). A species of Palaeutextularia is
not like the Johns Valley species. The ex-
tremely irregularly coiled Trepeilopsis is

abundant and shows the variable nature of
these forms. This genus is known to occur as
low as the Chouteau (or Rockford), al-
though described species are restricted to
the Pennsylvanian. Significant is the ab-
sence of such characteristically Pennsyl-
vanian genera as Polytaxis, Tetrataxis,
Endothyranella, and Reophax.

Chester and Morrow conodont literature
consists of only one paper for each of these
subdivisions (Branson and Mehl, 1940 and
Harlton, 1933). The conodonts in the Kin-
kaid are strongly Mississippian in character
containing none of the typically Penn-
sylvanian forms described by Harlton from
the Johns Valley. The two species of
Prioniodus, P. scitulus and P. varians, are
not known from beds younger than Chester.
A common Pennsylvanian genus, Cavus-
gnathus, is represented by C. cristata which
is easily distinguished from younger species.
The specimens of Hindeodella, while not
identifiable specifically, possess denticu-
lated bars similar to those described from
the Caney shale. A species of Taphrognathus,
not known heretofore above the Keokuk,
gives a distinct Mississippian aspect to the
Kinkaid fauna.

The ostracodes are of the greatest value
for determining the age of this fauna. The
literature contains two fairly complete
papers describing Kinkaid ostracodes
(Croneis and Thurman, 1938 and Cooper,
1942) and several additional papers describe
other Chester faunas. Information on Lower
Pennsylvanian ostracodes is contained
largely in papers by Roth (1929) and
Harlton (1929, 1933).

Plate 21 shows such typical upper Chester
species as Balantoides reticulatus Croneis
and Thurman (figs. 1-3), the three species of
Bairdia, B. golcondensis Croneis and Gale
(figs. 25, 26), B. attenuata (figs. 27, 28), and
B. impendere Cooper (figs. 29, 30), Bey-
richiopsis thori Coryell and Johnson (fig.
13), and the two species of Ectodemites, E.
planus Cooper (figs. 9-12) and E. tumida
Cooper (figs. 14-16). However, the Corni-
gella (figs. 4-6) is indistinguishable from C.
tuberculospinosa (Jones and Kirkby) listed
by Harlton as C. pushmatahensis in his
Johns Valley fauna which has a long range in
the Pennsylvanian. Also A mphissites insignis
Corneis and Thurman (figs. 19-22), differs

MICROFAUNA FROM JOHNSON COUNTY, ILLINOIS

85

little from A. mar ginij eras Roth from the
Union Valley and Wapanucka formations of
Oklahoma.

Glyptopleurina iniqua (pi. 22, fig. 35) and
Hollinella radiata (Jones and Kirkby) (figs.
20-23) are typical, easily recognized, and
range no higher than the Chester. However,
without close examination Glyptopleura
similis Croneis and Funkhouser (figs. 32-34)
might be confused quite easily with G.
coryelli Harlton which has a long range in
the Pennsylvanian. The species of Healdia
are characteristically Chester.

Other good Chester markers, are Glypto-
pleura tyri Coryell and Johnson (pi. 23, figs.
9-11), Perprimitia funkhouseri Croneis and
Thurman, (figs. 15-17), Polytylites quincol-
linus Harlton (fig. 25), and Sargentina crassi-
marginata Cooper (figs. 30-34). However,
the reversed forms of Sansabella harrisi
Croneis and Funkhouser (figs. 26-29) might
easily be mistaken for S. carbonaria Cooper
from the Pennsylvanian.

In summary, the fauna described is from
the youngest Mississippi an beds in the
type area, which can be studied in connec-
tion with the Mississippian-Pennsylvanian
contact. While predominantly Chester, the
microfauna reflects other Chester faunal
and sedimentological characteristics in that
it heralds the approaching Pennsylvanian
by showing a distinct break from the Middle
Mississippian, while at the same time con-
taining some early Pennsylvanian elements.
All of the fauna, with the exception of the
foraminifer Trepeilopsis and the ostracodc
Hollinella radiata show a complete lack of
Middle or Lower Mississippian affinity,
while most of the Foraminifera, including
the fusuline Millerella, and some ostracodes
and conodonts have a distinctly Pennsyl-
vanian character.

SYSTEMATIC DESCRIPTIONS

Order Foraminifera d'Orbigny, 1826

Family Fusulinidae M oiler, 1878
Genus Millerella Thompson, 1942

Millerella Thompson, 1942, Am. Jour. Sci., vol.
240, no. 6, p. 404.— Thompson, 1944, Kansas
Geol. Survey, Bull. 52, p 4i9 — Thompson,
1945, idem., Bull. 60, p. 40.

Shell disc-shaped, periphery angular to

rounded, usually completely planispiral, but
some species may have an endothyroid
juvenarium while others have only slight
irregularities in coiling; volutions 4 to 7,
completely involute to slightly evolute;
evolute species depressed or concave in polar
area (umbilicate) and convex in involute
forms; diameter one-fourth to one-half
millimeter, axis usually one-fourth to one-
third the diameter; spirotheca thin and
believed to possess three walls, septa thin
and long to short and thick (A-shaped);
proloculum very minute; tunnel and
chomata usually well developed.

The above generic description is essen-
tially that of Thompson (1942, p. 404) but
modified to include many subsequently
described species, including those from the
Kinkaid. The latter are entirely consistent
generically with the Pennsylvanian forms
and differ only in those minor structural
features which are usually considered spe-
cific.

Millerella chesterensis Cooper, n. sp.
Plate 19, figures 1-5

Shell very small, discoidal, periphery
rounded; juvenarium endothyroid, essen-
tially planispiral; spirotheca and septa
thick, the latter almost A-shaped in section,
essentially straight, but directed forward
making an angle of about 65°, on the
average, with spirotheca; coiling elongate
about juvenarium, resulting in an elongate
peripheral outline in sagittal section; last
volution partially evolute, forming a slightly
umbilicate shell, the degree of concavity
being unequal on opposite sides.

Data on shell measurements and septal
counts is shown in table 1.

M. chesterensis differs from M. marblen-
sis Thompson in its smaller size, shorter,
thicker septa, larger tunnel angle, rounded
periphery (see axial sections) and is almost
completely involute. M. inflecta Thompson,
although quite similar in axial section has
thinner spirotheca and septa, greater regu-
larity of coiling, a nonendothyroid juven-
arium, and larger proloculum, diameter and
form ratio.

Kinkaid formation, bed 5, JohnsonCounty,
Illinois.

86

CHALMER L. COOPER

Table 1

-Statistical Data for M. chesterensis, Measurements
in Microns

Spec.1

Septal Count

Prol.
Diam.

L.

W.

Ratio

Ht. Volutions

Tunnel

1

2

3

4

5

1

2

3 4

5

Angle

1

11

14

18

114

20

—

—

—

13

20

27

40

—

2

—

9

13

15

17

20

—

—

—

—

20

27

40

53

3

20

160

430

1:0.37

13

40

53

60

61

21°

4

20

140

350

1:0.40

13

20

27

40

60

21°

1 Specimens 1 and 2 are sagittal sections, 3 and 4 are axial sections. Specimen 1 is illustrated in pi. 19,
figs. 1, 5; 2, fig. 4; 3, fig. 4; and 4, fig. 2.

Millerella kinkaidensis Cooper, n. sp.
Plate 19, figures 9, 11

Shell small, discoidal; periphery sub-
rounded, involute, and only slightly umbili-
cate; walls thick, septa short, thick and
slightly curved; chambers small and about

Kinkaid formation, bed 5, Johnson
County, Illinois.

Millerella zelleri Cooper, n. sp.
Plate 19, figures 6-8

Shell very minute, regularly coiled, septa

as wide as high (see sagittal section); prolo- very short, thick, tapered, closely spaced,

Table 2. — Statistical Data for M. kinkaidensis, Measurements
in Microns

Spec.2

Septal count

Diam.
Proloc.

L.

W.

Ratio

Ht. volutions

Tunnel

1

2

3

4

1

2

3

4

5

angle

1
2

8

13

16

20

26

23

18

36

1:0.50

13

20
20

27
33

46
46

46

74

±30°

2 Specimen 1 is a sagittal section, 2 an axial section. Specimen 1 is shown on pi. 19, fig. 9; 2, fig. 1 1

culum relatively large; juvenarium endo-
thyroid. Data on shell measurements and
septal counts is shown in table 2.

M. kinkaidensis has a longer axis and
larger proloculum than the other two
Kinkaid species of Millerella. It differs from
Pennsylvanian species much as the other
Kinkaid species do.

forming rather small chambers; periphery
rounded; axial regions slightly and nearly
equally umbilicate, completely involute;
juvenarium endothyroid, but nevertheless
the coiling is regular.

Data on shell measurements and septal
counts is shown in table 3.

M. zelleri is distinguished from M.

Explanation of Plate 21

Figs 1-3 — Balantoides reticulatus Croneis and Thurman. Dorsal, lateral and end views, X50.

(p. 84)
4-6 — Cornigella tuberculospinosa (Jones and Kirkby). Dorsal, lateral and end views

X50.
(p. 89)
(p. 90)

(p. 84)
(p. 84)
(p. 90)
(p. 89)

7-8 — Cornigella golcondensis (Croneis and Gale). Dorsal and lateral views, X50.
9-12 — Ectodemites planus Cooper. Dorsal, ventral, lateral and end views, X40.
13 — Beyrichiopsis thori Coryell and Johnson. Lateral view, X40.
14-16 — Ectodemites tumidus Cooper. Dorsal, lateral and end views, X40.
17-18 — Coryellites concava (Cooper). Dorsal and lateral views, X40.

19-22 — Amphissites insignis Croneis and Thurman. Dorsal, ventral, lateral, and end views of
two specimens (fig. 19, is a single valve), X30. (p. 84)

23-24 — Coryellites portica Cooper, n. sp. Dorsal and lateral views, X40. (p. 89)

25-26 — Bairdia golcondensis Croneis and Gale. Dorsal and lateral views, X40, (p. 84)

27-28 — Bairdia attenuata Girty. Dorsal and lateral views, X40. (p. 84)

29-30 — Bairdia impendere Cooper. Dorsal and lateral views, X40. (p. 84)

ournal of Paleontology, Vol. 21

Plate 21

Cooper, Chester Ostracodes

Journal of Paleontology, Vol. 21

Plate 22

Cooper, Chester Ostracodes

MICROFAUNA FROM JOHNSON COUNTY, ILLINOIS

87

chesterensis by its thicker spirotheca, shorter
and thicker septae, its regularity of coiling,
and shorter axis. This is one of the smallest
described species of Millerella.

Kinkaid formation, bed 5, Johnson
County, Illinois.

Family Ammodiscidae Rhumbler, 1895

Genus Glomospira Rzehak, 1888

Glomospira disca Cooper, n. sp.

Plate 20, figure 18

Test minute, free, early volutions ir-
regularly coiled, but tending to lie within

Genus Trepeilopsis Cushman and Waters,

1928

Trepeilopsis mississippiana Cooper, n. sp.

Plate 20, figures 34-41

Test attached to Productus spines or free,
coiled in a tight conical spiral in early volu-
tions, later becoming a cylindrical coil,
finally the tube bends down across the spiral
coils in a broadly curved manner that is
roughly S-shaped; aperture at end of tube,
wide, somewhat flared.

Length (holotype), 0.52 mm.; diameter of
tube in last whorl, 0.05 mm.; width of
aperture, 0.056 mm.

Table 3.-

-Statistical Data for M . zelleri, Measurements
in Microns

Spec.3

Septal count

Diam.
Proloc.

L.

W.

Ratio

Ht. volutions

Tunnel

1

2

3

4

1

2

3

4

5

angle

1
2
3

11
9

14
11

16

13

18
16

20
20

23

10

27

1:0.36

13
13
13

20

27
20

27
33
33

40
40
40

46

53
46

Ca. 10°

3 Specimens 1 and 2 are sagittal sections, and 3 are axial section. Specimen 1 is shown on pi. 19, fig.
2, fig. 6, and 3, fig. 7.

plane of the last coil; tube increases regularly
in diameter.

Diameter, 0.23 mm.; thickness, 0.12 mm.

G. disca is smaller and more regularly
coiled than G. siluriana Ireland, nor is the
coiling so irregularly developed as in G.
diver sa Cushman and Waters.

Kinkaid formation, beds 5, 6, Johnson
County, Illinois.

T. mississippiana differs from S. grandis
Cushman and Waters by the marked curva-
ture of the latter portion of the tube and
from T. spirans (Cushman and Waters) by
the flaring aperture. It can be separated
from an undescribed Kinderhook species by
the smaller size, tighter coiling, and the long
taper of the latter.

Explanation of Plate 22

Figs. / — Kirkbyella quadrata Croneis and Gutke. Lateral view, X50.

2-4 — Healdia sulcata Cooper n. sp. Dorsal, lateral and end views of holotype, X50.

5-7 — Healdia caneyensis Harlton. Dorsal, lateral and end views, X50.

8-10 — Healdia aequabilis Cooper. Dorsal, lateral and end views, X40.

11-13 — Healdia elliptica Cooper. Dorsal, lateral and end views, X50.

14-16 — Healdia tenuicosta Cooper. Dorsal, lateral and end views, X50.

17-19 — Cavellina ovatiformis (Ulrich). Dorsal, lateral and end views, X30.

20-23 — Hollinella radiata (Jones and Kirkby). Dorsal, lateral, ventral and end views,

24-26 — Glyptopleura circumcostata Cooper. Dorsal, lateral, and end views, X40.

27-29 — Glyptopleura varians Croneis and Funkhouser, X40. 32, 34, Dorsal and end views.

33, Lateral view of left valve of another specimen.
30-31 — Cavellina librata Cooper. Dorsal and lateral views, X40.
32-34 — Glyptopleura similis Croneis and Funkhouser. Dorsal lateral and end views, X40.

(p. 90)
35 — Glyptopleurina iniqua Cooper. Lateral view of broken valve, X40. (p. 85)

(p. 90)
(p. 83)
(P- 83)
(p. 83)
(p. 85)

X30.
(p. 85)

CHALMER L. COOPER

Family Endothyridae Rhumbler, 1895
Genus Endothyra Phillips, 1845

A great variety of species has been as-
signed to this genus by various workers in
this country and abroad, forms ranging
from the almost completely evolute E. gal-
lowayi Thomas, discoid forms such as E.
ammonoides Brady and E. subtilissima
Brady, to such involute species as E. globula
(d'Eichwald). Many intermediate forms
with varying degrees of involution exist,
such as E. ameradaensis Harlton and E.
media Waters. Others, partially evolute on
one side and involute on the other include
the well-known E. baileyi (Hall) and the
genotype species, E. bowmani Phillips. The
habit of coiling is also extremely variable,
as shown by the regular planispiral of the
very flat species to the very great excentric-
ity of thick, bulbous forms exemplified by
E. baileyi. However, the heterogeneity of the
latter species is not so marked as was first
supposed, as shown by Scott, Zeller and
Nodine (1946), who demonstrate that it has
a definite axis of coiling for each half volu-
tion. Several species now classified with
Endothyra probably should be listed with
the primitive fusuline Millerella Thompson
(1942), such as E. radiata Brady, E. globula
(d'Eichwald) (Harlton, 1927) and possibly
E. ornata Brady to judge from its sagittal
section.

Endothyra acuta Cooper, n. sp.
Plate 20, figures 24, 30

Shell medium sized, 8 chambers in last
volution; periphery rounded; chambers
large and somewhat arched at periphery
due to deeply incised sutures as seen in
lateral outline; septal angle somewhat less
than normal, giving ~a "backward swing"
appearance, especially in last three or four
chambers; slightly biumbilicate, the left side
being more evolute; apertural face abrupt,
not in a plane normal to axis of coiling be-
cause the right side of the arch around the
aperture has developed faster than the left,
making it possible to view aperture from the
left side.

Greatest diameter (holotype), ca. 0.56
mm.; diameter, last chamber, ca. 0.20 mm.;
axial thickness, ca. 0.19 mm. (These dimen-
sions are approximate as last chamber of
holotype is crushed.)

E. acuta resembles E. whitesidei Galloway
and Ryniker in shape of chambers, but lacks
the marked evolute character of the latter.
It also has a larger aperture and conse-
quently a higher apertural face than the
Pennsylvanian species.

Kinkaid formation, beds 4 and 5, Johnson
County, Illinois.

Endothyra excentralis Cooper, n. sp.
Plate 20, figures 19-23

Shell small, thick, 6 to 8 chambers in last
volution; periphery rounded; chambers
bulbous, especially the final one which is
much thicker proportionally than the
others; sutures distinct and incised; right
side completely involute, left somewhat
umbilicate; aperture a crescent-shaped slit
located at the base of chamber, extending
from the center down the umbilicate side.

Greatest diameter (holotype), 0.48 mm.;
diameter last chamber, 0.26 mm.; axial
thickness, 0.16 mm.

E. excentra is similar to E. media Waters,
E. ovata Waters, E. distenta H. J. Plummer,
and E. rothrocki Harlton, but the shape of
the aperture differentiates it from the first
three and the central position of the aperture
distinguishes the latter.

Kinkaid formation, beds 4 and 5, Johnson
County, Illinois.

Family Astrorhizidae Brady, 1881

Genus Hyperammina Brady, 1878

Hyperammina cf. H. elongata

CLAVATULA HOWCHIN

Plate 20, figures 25-27

Hyperammina elongata clavatula Howchin, 1888,
Royal Micr. Soc. Jour., p. 535, pi. 8, figs. 1,2;
Mississippian limestones of England. — Harl-
ton, 1927, Jour. Paleontology, vol. 1, p. 16, pi.
1, figs, la, b; Upper Caney shale, Oklahoma. —
Harlton, 1933, idem, vol. 7, p. 8, pi. 1, figs, la-
e; John Valley shale, Okla.

The Kinkaid specimens cannot be dis-
tinguished from those occurring above
and below the Mississippian-Pennsylvanian
boundary in Oklahoma. However, . they
lack the pointed proloculum of //. elegantis-
sima H. J. Plummer, and H. spinescens
Cushman and Waters and the globular
proloculum of 77. bulbosa Cushman and
Waters, reported by Mrs. H. J. Plummer
from younger beds in Texas.

MICROFAUNA FROM JOHNSON COUNTY, ILLINOIS

89

Kinkaid formation, bed 7, Johnson
County, Illinois.

HYPERAMMINA cf. H. glabra Cushman

and Waters

Plate 20, figure 33

Hyperamimina glabra Cushman and Waters,
1927, Cushman Lab. Foram. Research Contr.,
vol. 3, p. 146, pi. 26, fig. 1; upper Strawn,
Texas. — Cushman and Waters, 1930, Texas
Univ. Bull. 3019, p. 33, pi. 2, figs. 1-3; Cisco
group, Texas.

This Kinkaid specimen seems to be
similar in most respects to the species from
the Pennsylvanian of Texas in its small
proloculum with a slight constriction above
it, followed by a long gradually widening
tube that is straight to slightly bowed.

Kinkaid formation, bed 4, Johnson
County, Illinois.

Hyperammina sp.
Plate 20, figures 28, 29

The two large fragments apparently be-
long to this genus but the absence of a
proloculum precludes specific designation.

Kinkaid formation, bed 7, Johnson
County, Illinois.

Family Textularidae d'Orbigny, 1846

Genus Palaeotextularia Schubert, 1920

Palaeotextularia asper Cooper, n. sp.

Plate 20, figures 31, 32

Test biserial, chambers flat, elongate, in-
creasing in size in a regular manner, with
sutures parallel and indistinct; aperture a
low, central slit at base of apertural face;
walls granular.

The biserial arrangement is similar to
Palaeotextularia sp. Harlton from the Johns
Valley shale, but the Kinkaid form is more
tenuous and has a more slender aperture.
P. asper is more stocky than P. grahamensis
(Cushman and Waters) and has a more
elongate aperture but is without the
globular chambers of the latter.

Kinkaid formation, bed 5, Johnson
County, Illinois.

Subclass Ostracoda Latreille, 1801

All ostracode species of this fauna are
illustrated (pis. 21-23) but descriptions are
presented only for those that are new.

Descriptions of the others may be obtained
readily from the published reports listed in
the references. Several short discussions
indicate the differentiation of some pre-
viously described Kinkaid species from
similar Pennsylvanian forms.

Family Bairdiidae Sars, 1887
Genus Coryellites Kellett, 1936

CORYELLITES CONCAVA (Cooper)

Plate 21, figures 17, 18

Bythocypris concava Cooper, 1941, Illinois Geol.
Survey Rept. Inv. 77, p. 28, pi. 3, figs. 3-6;
Vienna, Menard and Kinkaid formations, Illi-
nois.

This species described from the upper
Chester should have been classified under
Coryellites for the reasons set forth in the
report on the Pennsylvanian ostracodes of
Illinois (Cooper, 1946, p. 55).

Coryellites portica Cooper n. sp.
Plate 21, figures 23, 24

Carapace ovate, dorsal and ventral mar-
gins unequally arched; ventral margin
straight; ends rounded; posterior consider-
ably higher and thicker than anterior; over-
lap moderate and uniform around all
margins.

Length, 0.57 mm. ; height 0.35 mm. ; thick-
ness, 0.23 mm.; form ratio, 1.63.

C. portica resembles C. subelliptica (Up-
son) and C. johnsoni (Upson) but is more
highly arched and has a more nearly per-
pendicular posterior margin than these
Pennsylvanian species.

Kinkaid formation, bed 1, Johnson
County, Illinois.

Family Drepanellidae Swartz, 1936
Genus Cornigella Warthin, 1930

CORNIGELLA TUBERCULOSPINOSA (Jones

and Kirkby)
Plate 21, figures 4-6

(For synonomy see Cooper, 1946, p. 78.)

This multinodose form appears in several
Chester and Pennsylvanian ostracode zones.
The Kinkaid specimens are indistinguish-
able from those of the Pennsylvanian, typi-
cally possessing an elongate, but blunt spine-
like node anterodorsally, behind which is
another similar but shorter node. All other
nodes (there is usually a total of 6 to 8) are

90

CHALMER L. COOPER

smaller than two near the dorsum. The
only other Chester species, C. golcondensis
(Croneis and Gale), is considerably more
elongate.

Kinkaid formation, bed 1, Johnson
County, Illinois

Genus Varix Cooper, n. gen.

Carapace subovate, cardinal angles sub-
equal, with well-defined "swing," free mar-
gin (and part of dorsal margin) bordered by
a well-defined ridge, central portion marked
by irregular, more or less continuous ridges.

Genotype, Varix propria Cooper n. sp.

Varix conforms to other genera of the
family in its shape and bordering ridge, but
the irregularity of its other ornamental fea-
tures distinguishes it from its near relatives.

Varix propria Cooper, n. sp.
Plate 23, figures 12-14

Carapace elongate, subovate, hinge line
straight, ends rounded, ventral margin
slightly concave; cardinal angles very un-
equal, the anterior being about 90°, the
posterior markedly acute; free margins and
part of dorsal margin bordered by a promi-
nent ridge of uniform height and width;
central portion of shell marked by an ir-
regular ridge of similar character, sub-
rectangular to subelliptical, the axis of
"ellipse" parallel to ventral margin, with a
continuation of the ridge inside the "ellipse" ;
one side of the central portion of the ridge
develops into a loop anterior to a shallow
circular pit located near midlength; the
loop ends posterior to the pit in a small
circular node; near the center of the antero-
dorsal margin the outer loop rises above the
hinge line; articulation simple and appar-
ently without overlap.

Length (of holotype), 0.49 mm.; height,
0.38 mm.; form ratio, 1.44.

Kinkaid formation, bed 5, Johnson
County, Illinois.

Family Glyptopleuridae Girty, 1910

Genus Glyptopleura Girty, 1910

Glyptopleura similis Croneis and

Funkhouser

Plate 22, figures 32-34

Glyptopleura similis Croneis and Funkhouser,
1938, Denison Univ. Bull., Jour. Sci. Lab., vol.

S3, p. 352, pi. 10, fig. 4.— Cooper, 1941, pi. 7,
figs. 23, 24; Clore formation, Illinois.

This species has a rib pattern somewhat
similar to G. coryelli Harlton in that the rib
which is just above the pit bifurcates ante-
riorly. However, the two species may be
distinguished by their differences in lateral
outline, the Pennsylvanian species being
more quadrate, or not as subelliptical as in
G. similis.

Kinkaid formation, beds 4-6, Johnson
County, Illinois.

Family Healdiidae Harlton, 1933

Genus Healdia Roundy, 1926

Healdia sulcata Cooper, n. sp.

Plates 22, figures 2-4

Carapace short, tumid, lateral outline
subelliptical; dorsal margin strongly convex,
ventral margin nearly straight; posterior
ridge curved and directed strongly toward
posterior, rising but little above curvature
of shell as seen in dorsal view; ridge bordered
on anterior side by a deeply incised semi-
circular furrow of uniform width; overlap
prominent around dorsal and ventral mar-
gins, each valve developed at ends to pro-
duce a slightly incised articulation poste-
riorly and in irregular flare or "frill" on
anterior; surface smooth except for furrow.

Length, 0.52 mm.; height, 0.36 mm.;
thickness, 0.29 mm.

77. sulcata is readily distinguished by the
unusual furrow in front of the usual poste-
rior ridge which is typical of the genus.
However, t'his should not be confused with
the depressed area of Incisurella or the
trough formed by a row of pits in Cribro-
concha. Except for the furrow H. sulcata
is much like many other species such as H.
ornata Morey and H. ovoidea Cooper from
the Chester and H. ehlersi Bradfield and H.
nucleolata Knight from the Pennsylvanian.

Kinkaid formation, beds 4-6, Johnson
County, Illinois •

Family Kirkbyidae Ulrich and

Bassler, 1923

Genus Ectodemites Cooper, 1941

ECTODEMITES TUMIDUS Cooper

Plate 21, figures 14-16

Ectodemites tumidus Cooper, 1941, Illinois Geol.
Survey Rept. Inv. 77, p. 51, pi. 10, figs. 1-3.

E. tumidus, known only from the Kinkaid,

MICROFAUNA FROM JOHNSON COUNTY, ILLINOIS

91

resembles E. plummeri Cooper from the
Marble Falls (Texas) and Ferdinand (In-
diana) formations of Morrow age, in both
size and general shape. However, the ridges
of the younger species are more prominent,
the reticulations coarser, and the kirkbyan
pit larger and almost centered under the
medial node. The inner ridge of E. tumidus
is especially prominent compared to that of
E. plummeri.

Kinkaid formation, beds 4-6, Johnson
County, Illinois.

Family Kloedenellidae Ulrich and

Bassler, 1923

Genus Sansabella Roundy, 1926

Sansabella harrisi Croneis and

Funkhouser

Plate 23, figures 26-29

Sansabella harrisi Croneis and Funkhouser, 1938,
Denison Univ. Bull., Jour. Sci. Lab., vol. 33,
p. 334, pi. 9, figs. 7, 8; Clore formation. —
Cooper, 1941, Illinois Geol. Survey, Rept.
Inv. 77, p. 60, pi. 13, figs. 15, 16; Clore and
Kinkaid formations.
Sansabella- thurmani Croneis and Funkhouser,
* 1938, op. cit., p. 336, pi. 9, figs. 11, 12; Clore
formation.

Like many other species of Sansabella this
one is found in two forms, one of which is the
mirror image of the other. It resembles S.
carbonaria, from the Missouri series, but is
not so elongate, nor does it have the
angulated line of concrescence of the
Pennsylvanian species. The younger form
also has a more prominent pit.

Kinkaid formation, bed 4, Johnson
County, Illinois.

Genus Sargentina Coryell and

Johnson, 1939

Sargentina crassimarginata (Croneis

and Thurman)

Plate 23, figures 30-34

Sulcella crassimarginata Croneis and Thurman,
1938, Denison Univ. Bull., Jour. Sci. Lab., vol.
33, p. 328, pi. 7, figs. 15, 16; Kinkaid formation.

Sargentina crassimarginata, Cooper, 1941, Illi-
nois Geol. Survey, Rept. Inv. 77, p. 39, pi. 6,
figs. 9, 10; Kinkaid formation.

This common Kinkaid species is some-
what larger than representatives of the
genus which occur rather high in the Penn-
sylvanian system. S. tumida Cooper from
the "Centralia" zone may be distinguished
by its greater ellipticity and curved hinge-

line and 5. elongata Cooper from the Little
Vermilion is more elongated and has a
hinge margin that is more nearly straight.
Kinkaid formation, bed 4, Johnson
County, Illinois.

Conodonts Pander, 1856

Genus Cavusgnathus Harris and

Hollingsworth, 1933

Cavusgnathus cristata Branson and Mehl

Plate 20, figures 4-10

Cavusgnathus cristata Branson and Mehl, 1940,
Denison Univ. Bull., Jour. Sci. Lab., vol. 35,
p. 177, pi. 5, figs. 26-31; Caney shale, Okla-
homa.

This large species with its high platform
and deep trough, and the "cockscomb" de-
velopment on the oral side is confined to
Chester and younger formations. It is much
larger than the Pennsylvanian species, and
there appears to be little difference between
Caney and Kinkaid specimens, except that
those from the latter are slightly larger
(1.5 mm. and 2.0 mm., respectively).

Kinkaid formation, bed 4, Johnson
County, Illinois.

Genus Hindeodella Ulrich and

Bassler, 1926

Hindeodella sp.

Plate 20, figures, 11-13

This genus is represented only by frag-
ments of bars which are not specifically
determinable. However, three types of
dentition are represented: 1, Large denticles
alternating with groups of three smaller
ones, and slightly inclined (fig. 11); 2, large
denticles alternating with single small
denticles, all sharply inclined (fig. 12); and
3, all large denticles sharply inclined to bar
(fig. 13). Not enough specimens have been
obtained to determine characters that
might distinguish them from other Carbon-
iferous species.

Kinkaid formation, beds 1, 4, 6, Johnson
County, Illinois.

Genus Ligonodina Ulrich and

Bassler, 1926

Ligonodina cf. L. levis Branson and

Mehl

Plate 20, figure 17

Ligonodina levis Branson and Mehl, 1941,
Denison Univ. Bull., Jour." Sci. Lab., vol. 35,

92

CHALMER L. COOPER

p. 185, pi. 6, fig. 10; Keokuk formation, Mis-
souri.

Although fragmentary, the Kinkaid speci-
men conforms to this Keokuk species with
respect to the fairly heavy, slightly curved
cusp, thin bar with thin, discrete denticles;
projection probably slight judging from the
scar remaining.

Kinkaid formation, beds, 5, 6, Johnson
County, Illinois.

Genus Prioniodus Pander, 1856

Prioniodus scitulus Branson and Mehl

Plate 20, figures 1-3

Prioniodus scitulus Branson and Mehl, 1941,
Denison Univ. Bull., Jour. Sci. Lab., vol. 35,
p. 173, pi. 5, figs. 5, 6; Caney shale, Oklahoma.

This species with its erect cusp, lens-
shaped in cross section, with large appressed
denticles, free in upper half, and fluted pro-
jection, is typically Mississippian.

Kinkaid formation, beds 1, 4-6, Johnson
County, Illinois

Genus Taphrognathus Branson and

Mehl, 1941

Taphrognathus varians Branson and

Mehl

Plate 20, figures 14-16

Taphrognathus varians Branson and Mehl, 1941,
Denison Univ. Bull., Jour. Sci. Lab., vol. 35,
p. 182, pi. 6, figs. 27-41; Keokuk formation,
Missouri.

The Kinkaid species is similar in all
respects to that from the Keokuk, e.g., in

size, shape of bar both orally and aborally,
and shape and dentition of the blade.

Kinkaid formation, bed 1, Johnson
County, Illinois

REFERENCES

Bradfield, H. H., 1935, Pennsylvanian Ostra-
coda of the Ardmore basin, Oklahoma: Bull.
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Explanation of Plate 23

Figs. 1-4 — Monoceratina celsalobata Cooper. Dorsal and lateral views, X50.

5-8 — Monoceratina fur cula Croneis and Gale. Dorsal, lateral, ventral and end views, X50.

9-11 — Glyptopleura tyri Coryell and Johnson. Dorsal, lateral and end views, X40. (p. 85)

12-14 — Varix propria Cooper, n. gen., n. sp. 12, 13, Interior and lateral views of holotype;

14, lateral view of a paratype, X50. (p. 90)

15-17 — Perprimitia funkhouser i Croneis and Thurman, Dorsal, lateral and end views, X40.

(p. 85)
18-20 — Paraparchites nicklesi (Ulrich) Dorsal, lateral and end views, X40.
21-24 — Neokloedenella prima Croneis and Funkhouser. Dorsal, lateral, ventral and end views,

X30.
25 — Polytylites quincollinus (Harlton) Lateral view, X40. • (p. 85)

26-29 — Sansabella harrisi Croneis and Funkhouser. Dorsal and lateral views of reversed forms,

X40. < (p. 91)

30-34 — Sargentina crassimarginata Croneis and Thurman. Dorsal, lateral, ventral (right and

left valves) and end views, X40. (p. 91)

Journal of Paleontology, Vol. 21

Plate 23

Cooper, Chester Ostracodes

MICROFAUNA FROM JOHNSON COUNTY, ILLINOIS

93

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94 CHALMER L. COOPER

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