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Records of the Fossil Mammal Sinclairella, Family Apatemyidae, From the Chadronian and Orellan By: William Alvin Clemens |
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MUSEUM OF NATURAL HISTORY Volume 14, No. 17, pp. 483 491, 2 figs.
March 2, 1964
Records of the Fossil Mammal
Sinclairella, Family Apatemyidae,
From the Chadronian and Orellan
BY WILLIAM A. CLEMENS, JR.
UNIVERSITY OF KANSAS
LAWRENCE
1964
UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY Editors: E. Raymond Hall, Chairman, Henry S. Fitch,
Theodore H. Eaton, Jr. Volume 14, No. 17, pp. 483 491, 2 figs.
Published March 2, 1964 UNIVERSITY OF KANSAS
Lawrence, Kansas PRINTED BY
HARRY (BUD) TIMBERLAKE, STATE PRINTER
TOPEKA, KANSAS 1964
29 8587
Records of the Fossil Mammal
Sinclairella, Family Apatemyidae,
From the Chadronian and Orellan BY WILLIAM A. CLEMENS, JR.
Introduction
The family Apatemyidae has a long geochronological range in North
America, beginning in the Torrejonian land mammal age, but is
represented by a relatively small number of fossils found at a few
localities. Two fossils of Orellan age, found in northeastern Colorado
and described here, demonstrate that the geochronological range of the
Apatemyidae extends into the Middle Oligocene. Isolated teeth of
Sinclairella dakotensis Jepsen, part of a sample of a Chadronian
local fauna collected by field parties from the Webb School of
California, are also described. I thank Mr. Raymond M. Alf, Webb School of California,
Claremont, California, and Dr. Peter Robinson, University of
Colorado Museum, Boulder, Colorado, for permitting me to
describe the fossils they discovered. Also Dr. Robinson made
available the draft of a short paper he had prepared on the
tooth found in Weld County, Colorado; his work was
facilitated by a grant from the University of Colorado
Council on Research and Creative Work. I also gratefully
acknowledge receipt of critical data and valuable comments
from Drs. Edwin C. Galbreath, Glenn L. Jepsen, and Malcolm
C. McKenna who is currently revising the Paleocene
apatemyids and studying the phylogenetic relationships of
the family. The prefixes of catalogue numbers used in the
text identify fossils in the collections of the following
institutions: KU, Museum of Natural History, The University
of Kansas, Lawrence; Princeton, Princeton Museum, Princeton,
New Jersey; RAM UCR, Raymond Alf Museum, Webb School of
California, Claremont, California (the permanent repository
for these specimens will be the University of California,
Riverside); and UCM, University of Colorado Museum, Boulder,
Colorado. The system of notations for teeth prescribed for
use here is as follows: teeth in the upper half of the
dentition are designated by a capital letter and a number;
thus M2 is the notation for the upper second molar; teeth in
the lower half of the dentition are designated by a
lower case letter and a number; thus p2 is the notation for
the lower second premolar.
Family APATEMYIDAE Matthew, 1909 Genus =Sinclairella= Jepsen, 1934 =Sinclairella dakotensis= Jepsen, 1934
The type of the species, Princeton no. 13585, was discovered in
Chadronian strata of the upper part of the Chadron Formation cropping
out in Big Corral Draw, approximately 13 miles south southwest of
Scenic, in southwestern South Dakota (Jepsen, 1934, p. 291). Detailed
descriptions of the type specimen are given in papers by Jepsen (1934)
and Scott and Jepsen (1936). Isolated teeth of Chadronian age referable
to Sinclairella dakotensis have been discovered subsequently at a
locality in Nebraska and fossils of Orellan age, also referable to S.
dakotensis , have been collected at two localities in Colorado. The
sample from each locality is described separately.
Sioux County, northwestern Nebraska Material. RAM UCR nos. 381, left M1; 598, left m2; 1000,
right m1; 1001, right m2; 1079, right m2; 1674, right M2;
and 3013, left m2. Locality and stratigraphy. These Chadronian fossils were
discovered by Raymond Alf and members of his field parties
in several harvester ant mounds built in exposures of the
Chadron Formation in Sec... Continue reading book >>
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