626 



EEPORT UNITED STATES GEOLOGICAL SUEVEY. 



List of Jura Trias Jossils. 



Pentaorinus asteriscus. 

 Camptonectes bellistriatus. 

 Ostrea strigilecula. 

 Ostrea sp. ? 

 Trigonia sp. ? 

 Mytilus sp. *? 

 Myalina sp. ? 

 Volsella sp.M 



Eumicrotis curta ? 

 Myalina whiteil 

 Aviculopecten idaJioensis. 

 Myaeites sp.? 

 Volsella sp. ? 



Aviculopecten idahoensis f 

 Aviculopecten sp. "? 

 Lingula hrevirostris. 

 Ostrea sp. ? 

 ilf^yaci^essiJ.? 

 Eumicrotis curta. 



Pentacrinus asteriscus. 

 Camptonectes hellistriatus. 



Camptonectes stygius ? 



Pentacrinus asteriscus. 

 Ostrea strigilecula. 

 Tancredia sp. ?. 

 Undetermined concJiifers. 

 Undetermined g aster opods. 



Pentacrinus asteriscus^ 

 Neritinxji sp. ? 



Pentacrinus asteriscus. 

 Camptonectes hellistriatus. 

 Trigonia sp. *? 

 Myascites sp. ? 



Belemnites densus. 

 Aviculopecten IdaJioensis. 

 Grypluea sp. ? 

 Undetermined bivalves. 



Ostrea strigilecula. 

 Undetermined forms. 



Meelcoceras* aplanaUmi. 

 Meelcoceras gracilitatis. 

 Aviculopecten altus. 



-) 



Meridian Eidge south of canon of 

 ^ Fontenelle Creek. 



West side of Eock Creek, branch 

 of Twin- Creek, east of Bear 

 Eiver. 



1I:!l"orth side of Smith's Fork Valley 

 above the mouth, east of Bear 

 Eiver Yalley. 



> Sublette Eansre east of Station 38. 



) East of Smith's Fork of Bear 

 ] Eiver. 



Near the mouth of the lake branch 

 of Smith's Fork of Bear Eiver. . 



ISTorth side of Lake Creek. 



1 



ISTear mouth of McDougal's Creek, 

 f lower part of section Ko. 11. 



I^ear mouth of McDougal's Creek, 

 upper part of section JSTo. 11. 



i 



) stations 89 and 90, Aspen Eidge, 

 ] east of Soda Springs. 



) On Middle Creek, one of the south- 

 > ern branches of the Blackfoot 

 1 Eiver. 



* New genus established by Prof. A. Hyatt. 



