46 University of Texas Bulletin 



The following species of the fauna have been described by Cragin: 1 

 Pecten inconspicuus Tellina subaequalis 



Pholadomya postextensa Sphenodiscus emarg'.natits 



Corbula crassicistata Engonoceras belviderensis var. serpen- 



Tapes denisonensis tinum 



The following species were listed by Stephenson: 2 



Nucula sp. Cymbophora sp. 



Ostrea quadriplicata Shumard Turritella sp. 



Protocardia texana (Conrad) Anchura mudgeana White 



Cyprlmeria sp. Engonoceras serpentinum Cragin 



Corbula 3 spp. Crustacea 



An incomplete list of the Weno fossils on hand is given in the accompany- 

 ing table (Table 1) ; many species were omitted for further study. 



RANGES OF WENO FOSSILS 



The range as given in this table will demonstrate that one of the major 

 paleontological breaks in the Washita division lies at the base of the Weno 

 formation. The contact between the Denton and Weno formations is ap- 

 parently conformable, and many species cross it ; but a considerable num- 

 ber of others do not range higher than this contact while another consid- 

 erable group does not range lower. Without speculating as to the origins 

 of the latter group, it may be delimited more closely in view of a more 

 detailed study. 



ABBREVIATIONS FOR TABLE OF WENO FOSSILS 

 * Pyrite, limonite or hematite preservation. 

 I Nacreous preservation. 

 A Abundant 



Occasional 

 R Rare 



S Sand phase 



SH Shale phase 



M Marl phase 



L Limestone phase 



u upper part of formation 



m middle 



1 lower 



1 Cragin: Colo. Coll. Stud., 5, 1894, p. 49. 



2 Stephenson: U. S. G. S., Prof. Paper 120-H, 1918, p. 141. 



