Cretaceous at El Paso, Texas. 23 



2. Alternations of clay and soft argillaceous limestone 

 ledges. Fossils : Exogyra texana, Gryphcea tucum- 

 carii, Gryphcea fornicidata, Schlce-nbachia peruvia?ia, 

 2 other species of Schlce?ibachia, and a large Neithea, 24 ft. 



1. Argillaceous limestone, in thick ledges, weathering 

 into nodular limestone, the nodules surrounded by 

 clay. Fossils: Protocardia texana, Tylostoma peder- 

 nalis, Trochus, Turritella, Exogyra texana, an 

 Anchuroid genus, 2 sp. ol Kchinoids, Pleuromya 



Jcnoiolto?ii, Bequienia, etc _ 



1 1 feet from the top Ostrea subovata (?) 79 ft. 



Total thickness _ 698 ft. ± 



The following is a list of species from the various beds : 



JSFo. 9 of Section. 

 Exogyra sp. A large species related to E. ponderosa Roemer. 



No. 6 of Section. 



Nodosaria texana Conrad. 



Terebratula (Kingena) wacoensis Roemer. 



Ostrea subovata Shumard. Typical examples of the 



species. 

 Ostrea quadriplicata Shumard. 

 Gryphsea washitaensisHill. 

 Neithea texana (Roemer). 

 Gervilliopsis invaginata White ? 

 Plicatula incongrua Conrad. 

 Modiola sp. 



Trigonia emoryi Conrad. 



Cardium (Protocardia) multistriatum Shumard? 

 Turritella sp. Related to T. planilateris Conrad. 



No. 5 of Section. 



Pyrin a parry i Hall. 



Enallaster texanus (Roemer). 



Epiaster elegans (Shumard). 



Gryphaea washitaensis Hill. 



Neithea texana (Roemer). 



Lima n. sp. 



Lima wacoensis Roemer ? 



Modiola sp. 



Cardium (Protocardia) texanum Conrad. 



Turritella seriatim-granulata Roemer ? 



Aporrhais? ■■ Distinct from those in No. 1. 



Natica ? 



Schloenbachia leonensis (Conrad). 



