* 



Weno and Pawpaw Formations {> 



the exceptional variety of gerontic ammonites, especially Hamites; Scaph- 

 ites, Schloenbachia, Desmoceras and other genera are also prominent in 

 the fauna. 



DUCK CREEK LIMONITE AND PYRITE FOSSILS 



*Scaphites worthensis Adkins and Winton. 

 *Scaphites sp. aff. worthensis. 

 *Engonoceras sp. 



Hamites tanima Adkins and Winton. 

 Karaites spp. 

 *Crioceras (?) sp. 

 Schloenbachia sp. 

 *Neolobites (?) sp. 



*Arca sp. 

 *Nucula sp. 



*Turbo sp. 



*Lunatia sp. 



*Cerithium sp. 



*Nerinea sp. aff. pellucida Cragin 



*Cinulia sp. 



*Anchura sp. 



*Turritella sp. 



*Nerinea sp. 



*Placosmilia sp. 



DENTON CLAY FAUNA 



The clay facies of the Denton formation extends from northern Tar- 

 rant County (Blue Mound, near Haslet) to beyond Denison. It is char- 

 acterized by a great diversity of small pyrite and limonite ammonites, 

 some of them nacreous, and by many small Crustacea, mainly small pyritic 

 crabs. The ammonites seem more abundant southwards than on the 

 Red River and the Crustacea the reverse. 



FAUNA OF THE DENTON FORMATION 



* Limonite or pyrite species. 

 U Upper. 

 L Lower. 



*Acanthoceras sp. aff. aumalense Coquand 

 *Engonoceras sp. 

 *Mortoniceras sp. 



