Weno and Pawpaw Formations 



45 



gastropods, corals and other fossils. 1 This fauna has close resemblances to 

 that described by Pervinquiere- from the Vraconian of Tunis and Algeria, 

 a subject that will be considered later. 



The later Washita seas were transgressing over extensive land areas 

 and a large numerical expansion in the marine fauna occurred, probably 

 in part in the invaded trough already described. In addition, the portion 

 of the ocean bottom which received the mixed clay and sand deposits was 

 probably at a moderate depth and not far offshore, and permitted a wealth 

 and variety of fauna. Note the complexion of life in the Pawpaw seas: 

 swarms of sharks and dogfish; a multitude of bottom-loving Crustacea, 

 small crabs and lobsters, echinoids, oysters and scallops ; sessile corals and 

 worms; pelagic protozoa; a few large, free-swimming nautili and irides- 

 cent-shelled ammonites, and a great diversity of small ammonites. 



'THE WENO FAUNA 



Of the large and well preserved Weno fauna only a few species have 

 been mentioned in the literature, as follows : 

 Hill 3 listed the following fauna from the North Denison sands (=Weno) : 



Axinea sp. Tapes sp. 



Nuculaea sp. Turritella sp. 



Corbula sp. 



And the following from the Pawpaw shales and the North Denison 

 sands (not separated) : 



Turritella sp. (predominant) 

 Corbula sp. 

 Axinea sp. 

 Volsella sp. 

 Tapes sp. 

 Cytherea sp. 

 Tellina sp. 

 Aricula sp. 



Gervilliopsis or Gervillea 

 Area sp. 

 Nucula sp. 



Ammonites emarginatus Cragin 

 Spherwdiscus belviderensis var. 

 eerpentinum Cragin 



Trigonia emoryi Conrad 



Pholadomya postextensa Cragin 



Cyprimeria (large sp.) 



Anchura mudgea.no, White 



Lcda 2 spp. 



Mactra sp. 



Dentalium sp. 



Scularia sp. 



Ostrea quadriplicata Shumard 



Pecten inconspicuus Cragin 



Yoldia microdonta Cragin 



Turritella seriatim-granulosa Roemer 



Astarte sp. 



throughout this paper an asterisk (*) preceding the name of a fossil indicates that 

 the fossil has pyrite, limonite or hematite preservation; a double dagger (J) indicates 

 nacreous preservation. 



2 Pervinquiei - e: fitudes de Paleontologie Tunisienne. Paris, 1907. 



'Hill: Bull. Geol. Soc. Amer., 5, 1894., and 21st Ann. Kept., U. S. G. S. pt. 7, p. 277, 

 1901. 



