26 University of Texas Bulletin 



Military Crossing belong to the upper Wichita, or perhaps the lower 

 Clear Fork. 



The fauna of the beds at the Military Crossing shows that they 

 cannot be much different in age from the Leonard formation and may 

 possibly be an equivalent of the lower part of the zone of Perrinites. 

 The beds at Salt Croton Creek certainly correspond to the upper part 

 of the Leonard formation where P. vidriensis is the most common fos- 

 sil. The result is somewhat surprising because the thickness of the 

 Clear Fork formation is about 1900 feet, and that of the lower half of 

 the Double Mountain about 700 feet, while that of the Leonard forma- 

 tion is probably not much over 700 feet. This may possibly be ex- 

 plained by the difference of facies as there cannot be much doubt that 

 paleontologically the beds at the Military Crossing cannot be much 

 older that the Leonard formation, while the middle part of the Double 

 Mountain certainly corresponds to the upper part of the Leonard 

 formation. Both localities of Central Texas are certainly older than 

 our Word formation and of course also older than the Delaware Moun- 

 tain formation. These latter zones may be represented by the upper 

 part of the Double Mountain formation. 



The locality at Quanah, Hardeman County, was apparently dis- 

 covered by Ch. N. Gould. On a recent trip to this place which I made, 

 accompanying Dr. J. W. Beede, we collected quite a number of gen- 

 erally badly preserved specimens of Perrinites. Some of the better 

 preserved individuals show the details of the suture, which are quite 

 different from those of Perrinites Hilli as well as Perrinites vidriensis, 

 the saddles being much more slender and deeper scalloped, although 

 the branches are in general simpler of outline. The species is more 

 evolute than the other two mentioned, and has to be considered as new, 

 the external form being entirely different from that of P. Cumminsi. 

 The only other ammonoid observed by us at the same locality was a 

 very large Gastrioceras, larger than any other one so far described, 

 but so badly preserved that it is practically undeterminable. The lo- 

 cality is north of the Acme Cement Mills west of Quanah, and a little 

 south of the first wagon road running east and west. 



The locality near San Angelo where Medlicottia Copei? was found 

 must be above the Albany formation which is considered as an equiva- 



