62 



GEOLOGY OF THE EUEEKA DISTRICT. 



4. White quartzite. (Eureka quartzite.) 



5. Dark gray limestone, massive bedding, with intercalated slialy layers 



carrying a typical Silurian fauna. (Pogonip limestone.) 



6. Siliceous cherty limastoiie 



Feet 



200 



300 



75 



4,275 



^Pogonip 

 Limestone. 





'F.ureKa. JuoneM 1 . .Devonian. 



Quartzite Limestone Limestone 



FIG. 2. Section across Lone Mountain. 



Iii the Nevada limestone at Lone Mountain the fauna is exceedingly 

 rich in species. A list of the fossils occurring here, together Avith some 

 remarks upon their geological significance, will be found in the following 

 chapter in the discussion of the Devonian rocks. 



