PERMIAN VERTEBRATE FOSSILS IN TEXAS 739 



called the Albany beds and were assigned to the Coal Measures. 

 Subsequent study, however {Texas Academy of Science Trans., Vol. 

 II, pp. 93-98), disclosed the fact that the beds were stratigraphically 

 continuous with the Wichita, being simply deposits in deeper waters, 

 and in all subsequent publications they have been included in the 

 Wichita, referred to the Permian, and the name Albany dropped. 



The Clear Fork beds are composed of bedded hmestone, mag- 

 nesian and earthy, followed by clays, limestones, and shales, and 

 are more sandy toward the top. 



The Double Mountain beds comprise sandstones, sandy shales, 

 earthy limestone, clays, and thick beds of gypsum. 



For details of the sections reference is made to the Second Annual 

 Report of the Geological Survey of Texas, pp. 402 ff. 



So far as our collections show, the first vertebrate fossils are found 

 in beds which are a little below the middle of the Wichita division. 

 The beds below these, while not differing materially in character, are 

 possibly the representatives of the transition beds of the territory north, 

 as Adams suggests,^ but from the evidence here given it is plain that 

 such a reference cannot apply to any beds west of Onion Creek. 



In describing these localities I have begun with those nearest the 

 base and have given them as nearly in stratigraphic sequence as 

 our present knowledge will permit. 



I have tried to give all localities at which we made collections of 

 vertebrate fossils, whether the forms have been identified or not. 



LOCALITIES OF WICHITA DIVISION 



Onion Creek. — A few miles east of Archer City there is a small 

 tributary on the south side of the Little Wichita River called Onion 

 Creek. Near the mouth of this stream, the first fossil vertebrate of 

 the Texas Permian was found by Professor Jacob Boll, who afterwards 

 sent it to Professor Cope. 



Cottonwood Creek. — This creek is about ten miles south of Archer 

 City and is a tributary of the South Fork of Little Wichita. 



Fire Place. — This is on the west side of the South Fork of the 

 Little Wichita about six miles south of Archer City. It is one of 

 Boll's localities. 



» Bulletin of the Geological Society of America, Vol. XIV, pp. 191-200. 



