570 C. SCHUCHERT PALEOGEOGRAPHY OF NORTH AMERICA 



forms are few, appearing only in the few beds of limestone that persist. Along 

 with them in this region appear vertebrate remains upon which the references 

 to the Permian have been based. It is the conclusion of the author that the 

 Red Beds of this region are the near-shore representatives of the Albany and 

 the decision as to their age will rest upon that of the latter." 



In this connection it should be stated that Cummins 203 has recently 

 given "the localities and horizons of Permian vertebrate fossils in Texas." 

 He shows that the two divisions Wichita (includes the Albany) and Clear 

 Fork have distinct vertebrate associations (the Double Mountain division 

 is almost devoid of these remains). The Wichita is marked by the stego- 

 cephalian genus Cricotus, by the reptilian Cotylosauria genera Chilonyx 

 and Bolosaurus, and the reptilian Pelycosauria genera Clepsydrops, Cteno- 

 saurus, Tlieropleura, Metamosaurus, Paleosaurus, and Embolophorus. 



Restricted to the Clear Fork there are of Stegocephalia DiplocauJus. 

 Dissorhopus, Aclieloma, and Anisodexis; of Cotylosauria Bolbodon, Iso- 

 dectes, Hypopnous, and Labidosaurus ; all the Chelydosauria ; and of Pely- 

 cosauria Edaphosaurus. 



Common to the Wichita and Clear Fork there are of Stegocephalia 

 T rimer orliacis, Zatrachys, and Eryops; of Pelycosauria Diadectes, Empe- 

 dias, Parioticlius, and Pantylus; of Pelycosauria Dimetrodon and Naosau- 

 rus. With this evidence at hand, it must be agreed, at least for the pres- 

 ent, "that the divisions of Wichita and Clear Fork which were proposed at 

 first on purely stratigraphic grounds are fully warranted and upheld by 

 the fossils found in them" (Cummins). 



In the Whitehorse member of the Woodward division, Beede 204 describes 

 among others from Oklahoma Dielasma scliucherti (certainly a Permic 

 type of brachiopod) and a number of pelecypods. From the Quartermaster 

 division come the same brachiopod, many new pelecypods, and univalves. 



In the Eed Beds of the Enid of Oklahoma there has been found the 

 phyllopod Estlieria minuta, the amphibians Eryops megacephalus, Diplo- 

 cauJus, Trimerorliacliis, Cricotus, CricotiUus (restricted here), and Crosso- 

 telus; and the reptiles Naosaurus, Parioticlius, and Pleuristion. These 

 belong to the same general land fauna as that found in the Wichita of 

 Texas. The latter area contains a far greater number of amphibians and 

 reptiles, which have been described by Cope. Recently Case 205 has restud- 

 ied the Pelycosauria. 



The plants collected by Cummins in the Wichita are, according to Fon- 

 taine and I. C. White , 206 identical with those of the Dunkard Creek series 



203 Cummins : Journal of Geology, vol. 16, 1908. 



204 Beede : Kansas University of Science, Bull. no. 4, 1907. 



205 Case : Publication no. 55, Carnegie Institution of Washington, 1907. 

 208 White : Bull. Geological Society of America, vol. 3, 1892, p. 217. 



