626 



EEPORT UNITED STATES GEOLOGICAL SURVEY. 



List of Jura Trias Jossils. 



Pentacrinus asteriscus. 

 Camptonectes bellistriatus. 

 Ostrea strigilecula. 

 Ostrea sp. ? 

 Trigonia sp. ? 

 Mytilus sp. f 

 Myalina sp.? 

 Volsella sp. ? 



Eumicrotis curta *? 

 Myalina %vliitei% 

 Aviculopecten idalioensis. 

 Myacites sp. ? 

 Volsella sp. ? 



Aviculopecten idalioensis ? 

 Aviculopecten sp. ? 

 Lingula brevirostris. 

 Ostrea sp. ? 

 Myacites sp. ? 

 Eumicrotis curta. 



> Meridian Ridge south of canon of 



l 'Fnut.PTip.llp. (Vrppk 



West side of Eock Creek, "branch 

 of Twin- Creek, east of Bear 

 Biver. 



Forth side of Smith's Fork Valley 

 • above the mouth, east of Bear 



Biver Valley. 



Pentacrinus asteriscus. 

 Camptonectes bellistriatus. 



Camptonectes sty gins" 1 . 



Pentacrinus asteriscus. 

 Ostrea strigilecula. 

 Tancredia sp. ? 

 Undetermined concliifers. 

 Undetermined gasteropods. 



Pentacrinus asteriscus"! 

 JSferitina sp. ? 



Pentacrinus asteriscus. 

 Camptonectes bellistriatus. 

 Trigonia sj). ? 

 My ascites sp. ? 



JBelemnijtes densus. 

 Aviculopecten Idalioensis. 

 •Gryphcea sp. ? 

 Undetermined bivalves. 



'Ostrea strigilecula. 

 Undetermined forms. 



Meekoceras* aplanatum. 

 Meelcoceras gracilitatis. 

 Aviculopecten alius. 



> Sublette Bange east of Station 38. 



) East of Smith's Fork of Bear 

 } Biver. 



Near the mouth of the lake branch 

 of Smith's Fork of Bear Biver. 



North side of Lake Creek. 



} 



Near mouth of McDougal's Creek, 

 f lower part of section No. 11. 



Near mouth of McDougal's Creek, 

 upper part of section No. 11. 



5 



) Stations 89 and 90, Aspen Bidge, 

 J east of Soda Springs. 



} On Middle Creek, one of the south- 

 > ern branches of the Blackfoot 

 ) Biver. 



New. genus. established by Prof. A. Hyatt. 



