320 



(lEOLOCa- OF THE EUREKA DISTRICT. 



The Lower Silurian embraces the fauna of the Pogouip limestone beneath the 

 Eureka quavtzite, and the Silurian fauna above the quartzite i.s represented by the 

 meager collections obtained from the Lone Mountain limestone. 



Under the grouping of Carboniferous fossils are included the fauna fi'om the 

 great belts of limestone both above and below the Weber conglomerate. 



Included in the list is the collection obtained from the White Pine Mountains, 

 situated about 40 miles southeast of Evireka. The fauna from the base of the 

 Pogoni]) to the summit of the Devonian is so closely related to that of the Eureka 

 District that they may well be studied together, and in the tables are arranged in 

 jiarallel columns. 



The reader who desires more detailed information in regard to the specific 

 character of the fauna is referred to the descriptions given in the Paleontology of the 

 Eureka District, above mentioned. 



SYSTEMATIC LIST OF FOSSILS OF EACH GEOLOGICAL HORIZON. 



CAMBRIAN. 



PROSPECT MOUNTAIN TERRANE. 

 [The double multiple (XX) denotes that the species passes to the group above.] 



Genera and species. 



Porifera. 



Protospongia feuestrata Salter 

 sp.f 



Brach iopoda . 



Discina sp. ? 



Lingulepis maira H. & W 



? minuta H. »&W . 



Lingnlaf manticnla White 



Obolella discoidea H. & W 



sp.? 



Acrothele ? diehotonia Walcott 

 Acrotreta gemma Billings 



Kiitorgina prospectensis Walcott 



sculptilis Meek 



whitfieldi Walcott . . . 



Lept;ena melita H. & W 



Orthis eurekensis Walcott 



sp.? 



Pterojioda. 



Stenotheca elougata Walcott 



Hyolithes primordi.alis Hall (sp.) 



Scenella ? couula Walcott 



Eureka. 



XX 



XX 

 XX 



White 

 Pine. 



Remarks. 



Type from the Cambrian of Wales. 



Fragment. 



Types from Eureka and White Pine dis- 



trict.s, Nevada. 

 Type from Eureka District. 

 Type from Schell Creek Range, Nevada. 

 Type from Eureka District. 

 Like O. pretiosa Billings. 



Type from Calciferous formation in New- 

 foundland. 



Type from Gallatin River, Montana. 



Type from Eureka District. 



Type from St. Croix (Potsdam) sandstone 

 of Wisconsin. 



