Record of Geology of Texas, ISSV-ISQG. 
43 
CoPE^ Edward D. 
Plains. Equus simpUcidens, Cope. Greccoides oshornii, 'Shufeldt. Tes- 
tudo turgida. III. On a Mesozoic Pycnodont — Microdus dumhleii. IV. 
Triassie or Dockum beds. Episcoposaurus haplocerus. 
“1. Fayette Formation. 
‘‘In the First LA.nnual [Report of the iGreological 'Survey of Texas (p. 47), 
Mr. K. A. F. Penrose, Jr., describes this formation as it occurs in iSouth 
and East Texas. He places it at the summit of the Tertiary series and 
below the ‘Post- tertiary’; that is, at the summit of the GSTeoeene, just prior 
to the advent ef the Pleistocene. This location is justified by the only 
vertebrate fossils definitely traceable to these beds, which have been sent 
me for identification by Mr. E. IT. Humble, 'State Geologist of Texas. One 
of these consists of a well-preserved left ramus with symphysis and nearly 
complete dentition of the mandible of the large lama, Holomensicus Jiester- 
nus Leidy. This species is charaeteristic of the Equus beds of Oregon, 
'California and Mexico, and indicates satisfactorily the age of the formation 
in which it occurs. It confirms fully the position assigned to the Fay- 
ette beds by Mr. Penrose and by President Chamberlain for their eastern 
extension. The only other identifiable fossil from this formation is several 
teeth of the Equus major Dekay. This species is most abundant in the 
Eastern 'States, where the Equus beds have not been certainly identified; 
but it occurs also in the Equus beds of Hueces county, with other charac- 
teristic species of that epoch. The specimens of the two species named 
came from Wharton county.” 
“II, 'Upper Cenozoic of the (Staked Plains. 
“In some remains of vertebrata, obtained by Mr. W. P. Cummins, from 
iCrosby county, Texas, and sent me for determination by Mr. E. T. Humble, 
(State Geologist, four genera may be identified, and several others are indi- 
cated. (The four genera are Equus, Mastodon, Creccoides g. n., and Tes- 
tudo. They are enclosed in a white siliceous friable chalk, which Mr. 
Louis Woolman finds on examination to be highly diatomaceous. Pro- 
fessor C. Henry Kain had identified the following species : Campylodiscus 
hicostatus W. 'Smith; Epithemia gihha Ehr.; E. zebra Ehr. ; E. gibberula 
var. producta Ehr.; Navicula major Ehr.; V. viridis Ehr.; N. rostrata 
Ehr.; N. elliptica var. minutissima Green; Qomphonema clavatum Ehr.; 
Cymbella cistula Hemp.; Fragillaria vivescens Faffs var. The formation 
has been named the Blanco Canyon by Mr. W. F. Cummins, of the Survey 
(iKeport 18'90, p. 190, without sipecific location in the Cenozoic series). 
“The Mastodon is of the M. angustidens type, as indicated by the teeth, 
but there are not enough fragments preserved to render it clear whether 
they pertain to this species or some allied one. The Equus is allied to 
the E. occidentalis of Leidy, but the enamel plates are more simple than 
in that species, being the most simple known in the genus. I regard it as 
an undescribed species, and describe it below under the name of Equus sim- 
plicidens. A second species of horse is indicated, but an exact determina- 
tion cannot be made without additional material. The tortoise is a terres- 
trial form, but there is not enough preserved for identification.” Pp. 251- 
252. 
