90 GEOLOGY OF THE EUREKA DISTRICT. 



Sanguinolites iitenia. Euomphalu.s subiiigosus. 



Sauguinolites retusus. Pleurotomaria nodomarginata. 



Saugiiiuolites salteri. Bellerophou textilis. 



Saiiguiuolites simplex. Naticopsis, sp. ? 



Sauguiuolites striata. Deutaliiim, sp. 1 



Microdou connatus. Orthoceras randolphensis. 



Schizodus cimeatus. Ortlioceras, sp. 1 



Scliizodus deparcus. Goinphoceras, sp. ? 



Cardiola filicostata. Griffithides portlocki. 



Below this liorizon there is a bed of bluish gray limestone interesting 

 on account of its grouping of Lower Coal-measure fossils without the 

 presence of any of those species which might be regarded as indicating a 

 lower stratigraphical position, but which are here found in the overlying 

 strata. The list is small, but cliaracteristic of the Coal-measures. It is as 

 follows : 



Fenestella, sp. ? Productus semireticulatus. 



Streptorhyuchus crenistria. Spirifera camerata. 



Choaetes granulifera. Ehyiichonella evu-ekensis. 



Productus prattenianus. Griffitliides portlocki. 



Richmond Mountain Fauna.— There is some reasou to belicve that the inter- 

 calated arenaceous and calcareous strata lying at the base of the great 

 limestone belt all the way from Richmond Mountain southward to Fish 

 Creek Valley represents a portion of the chocolate-colored clay shales 

 underlying the limestone of Diamond Peak, and referred to the upper 

 members of the Diamond Peak quartzite. From the base of the Lower 

 Coal-measure limestone along the Hoosac fault up to the capping of 

 andesite lavas of Richmond Mountain the hig-hly inclined strata measure 

 about 1,800 feet. Fossils occur scattered throughout the limestones. From 

 highly fossiliferous strata favorable for their preservation, a grouping of 

 species was found which may be taken as typical of the entire epoch, 

 although only in a few localities is the life so full and well represented. 

 This list from the southwest base of Richmond Mountain is as follows : 



Zapbrentis. ' Streptorliynchus crenistria. 

 Peuestella, sp. ! Chonetes grauulifera. 



Liugula mytaloides. Productus longispiuus. 



Discina newberryi. Productus nebrasceusis. 



