490 INDEX TO THE STRATIGRAPHY OF NORTH AMERICA. 



Batrachia: 



Diplocaulus magnicomis (?) Cope, 

 limbatus (?) Cope, 

 salamandroides Cope. 

 Trimerorliachis sp. Cope. 



leptorhynchus sp. nov. 

 Cricotus sp. Cope. 



Cricotillus brachydens g. et sp. nov. 

 Eryops megacephalus Cope. 

 Crossotelos annulatus g. et sp. nov. 

 Reptilia: 



Naosatirus sp. Cope. 

 Embolopliorus (?) sp. Cope. 

 Pariotichus ordinatus Cope. 



sp. Cope. 

 Pleuristion brachycoelous g. et sp. nov. 



A number of vertebrates have recently been discovered 5 miles east of Pond Creek, Grant 

 County. These bones have not been identified, but from superficial examination they appear 

 very similar to the specimens from Nardin or Orlando. 



In a ledge of soft, sandy dolomite which underlies the Medicine Lodge gypsum near Fet- ■ 

 guson, Okla., a number of invertebrates have been found, among which Dr. J. W. Beede finds 

 the following forms : PleuropTiorus subcuneatus Meek, Schizodus ( ?) like S. wheeleri. 



Near Whitehorse Spring, 16 miles west of Alva, a considerable number of invertebrates 

 were obtained. Dr. Beede identified the following genera:*^ Naticopsis, Pleurotomaria, Pleuro- 

 phorus, Lima, Sedgwickia, Aviculopecten, Bakewelha, Conocardiinn, and Dielasma. The last 

 four genera are represented by new species. 



Regarding the age of the red beds, Dr. WiUiston identifies Eryops megacepJialus, from 

 Nardin, as a Permian amphibian, described by Cope, from Texas. Of the Orlando fossils, he 

 says: "Altogether these fossils unmistakably point to the Permian." Dr. Case points out the 

 close resemblance of these fossils to similar forms from the Penman of northern Texas, Ireland, 

 and Bohemia.* 



Dr. Beede, in the paper referred to, in speaking of the Whitehorse invertebrates, says : " 



"On the whole, these fossils show an advance over the fossils of the Permian below. Some 

 of the species still persist, as we should expect from the fact that there is no unconformity 

 between these various formations. On the other hand, there is a new species of Dielasma 

 belonging to a group new to the American Permian. * * * Taking all this into considera- 

 tion, there can be little doubt that the age of these beds is Permian." 



Of these localities, Orlando, Nardin, and Pond Creek are in the Enid formation. Gypsum 

 HiUs locality in the Blaine, and the Whitehorse locality in the Whitehorse sandstone, the 

 middle member of the Woodward formation. So fas as known no fossils have been found in 

 the Greer and Quartermaster formations of Oklahoma, but there is no reason for supposing 

 that these beds differ greatly in age from those immediately subjacent.'' 



J-K 13. SOTJTHEBN WYOMING AND NORTHERN COLORADO. 



The so-called "Red Beds" of this region, long supposed to be chiefly or wholly 

 Triassic, are now known to be in part at least Permian. The Triassic age of the 

 remaining upper portion has been questioned but is established by WiUiston. 

 Prior to Williston's publication, Cross ^^^™ reviewed the evidence as foUows in part: 



The Red Bed section of the mountainous portion of Colorado and Wyoming is clearly not 

 divisible into the units traceable throughout the plateau province. * * * The changes in 



o Beede, J. W., Advance Bull. Second Ann. Kept. Oklahoma Geol. Survey, April, 1902. 

 6 Letter of November 24, 1900. 

 c Op. cit., p. 62. 



d Since the above was written fossils found in the Quartermaster sandstone in CoUingworth County, Tex., have 

 been identified by Dr. Beede, who finds that they are very similar to those from Whitehorse and of Permian age. 



