Cretaceous at EL Paso, Texas. 25 



Notes on the Fauna. 



Taking the fauna of the section as a whole, its essential iden- 

 tity with that of the noted Tucumcari region in New Mexico 

 and of other localities on the western and northern borders of 

 the Lower Cretaceous area is at once apparent. The follow- 

 ing list of species reported from Tucumcari is compiled by 

 Mr. E. T. Hill in a recent paper :* 



Turbinolia texana Conrad. 



Ostrea marsh i Sowerby ( = 0. subovata Shumard). 



Ostrea quadriplicata Shumard. 



Gryphaea dilatata, var. tucumcarii Marcou. 



Gryphsea pitcheri Morton. 



Exogyra texana Roemer. 



Plicatula sp. 



Neithea occidentalis Conrad. 



Trigonia emoryi Conrad. 



Protocardia multistriata (Shumard). 



Protocardia texana Conrad. 



Cytherea leonensis Conrad. 



Pinna comancheana Cragin. 



Cardita belviderensis Cragin. 



Tapes belviderensis Cragin. 



Roudairia (?) quadrans Cragin. 



Cyprimeria sp. 



Turritella seriatim-granulata Roemer. 



Turritella marnochi White ? 



Ammonites leonensis Conrad. 



These species, according to Mr. Hill, come from sandy and 

 shaly beds below the supposed Dakota sandstone with a total 

 thickness of 115 feet. 



In the El Paso section, although there are one or two 

 species that range from JSTos. 1 to 6 inclusive, there are at least 

 three well marked paleontological zones, each characterized by 

 peculiar species that have been found useful as guide fossils in 

 other parts of the Texan Lower Cretaceous area. Thus the 

 fossils from No. 16 indicate a horizon in the upper part of the 

 Washita corresponding to the Denison beds, that portion of 

 the Washita in the Denison section that overlies the restricted 

 Fort Worth limestone. 



No. 5 contains Schloenbachia leonensis and Ejpiaster elegans, 

 which are regarded as the most characteristic species of the 

 Fort Worth limestone. 



* Outlying Areas of the Comanche Series in Kansas, Oklahoma and New 

 Mexico, this Journal, III, vol. 1, p. 230, Sept., 1895. 



