WEBER CONGLOMERATE. 91 



Productus pratteuianus. Athyris hirsuta. 



Productus semireticulatus. Rhynchonella eurekensis. 



Spirifera annectans. Camarophoria cooperensis. 



Spirifera camerata. Terebratula hastata. 



Spirifera ieidyi. Aviculopecten afflnis. 



Spirifera neglecta. Streblopteria similis. 



Spirifera rockymontana. Myalina congeneris. 



Spirifera atriata. Bellerophon, sp. f 



Spirifera (M.) setigera. Metoptoma peroccidens. 



Syringothyris cuspidatus. Griffithides portlocki. 



Along Carbon Ridge the limestones are well developed but have as yet 

 yielded little calling for special comment as regards the life of the period. 

 The limestone forming the top of Diamond Peak and the long Alpha ridge 

 west of Hayes Canyon carry several fossiliferous strata at different hori- 

 zons, but all of them present much of the same grouping of species. Near 

 the summit of Diamond Peak a shaly limestone was found to contain 



Polypora (like P. stragula). Spirifera (M.) setigera. 



Orthis resupinata. Athyris roissyi. 



Productus nebrascensis. Athyris hirsuta. 



Productus semireticulatus. Griffithides portlocki ? 



Spirifera trigonalis. Camarophoria cooperensis. 



It seems hardly necessary to repeat nearly similar lists from neigh- 

 boring localities so long as there appears to be no marked change of fauna 

 with the development of the limestones. Most of the species obtained 

 proved to be specifically identical with those from the limestone body of 

 Richmond Mountain and Carbon Ridge east of the Hoosac fault. The 

 region of Diamond Peak does not offer as many species, but on the other 

 hand it has not been as diligently searched. The Lamellibranchiate fauna 

 was nowhere recognized in the region of Diamond Peak. 



Weber Conglomerate. Conformably overlying the Lower Coal-measures 

 comes the Weber conglomerate, one of the most persistent and well defined 

 horizons over wide areas of the Cordillera, stretching westward all the way 

 from the Front Range in Colorado to the Eureka Mountains. It varies in 

 the nature of the sediment with every changing condition, but it is nearly 

 everywhere easily recognized as a siliceous formation between two great 

 masses of Carboniferous limestone. In places it is made up of an admixture 



