8ILVEE PEAK. 189 



tog-ether with paleontological evidence, may be readily correlated with the 

 lower part of the Cambrian of Eureka and the Highland Range. The 

 thicknesses are estimated. The section is as follows r 1 



South end of Timpahute Range. Eastern Nevada. 



Feet. 



1. Heavy bedded gray limestone, light and dark 400 



2. Yellow argillaceous shale: 



(a) Yellow shale 350 



(6) Yellow sandstone 75 



(c) Yellow and green shale, with fillets of fossiliferous limestone 



(Conocoryphe) 500 



925 



3. Purple ripple-marked vitreous sandstone, with bands of siliceous shale. . . 1, 000 



Total 2,326 



The lower bed corresponds to the Prospect Mountain quartzite. In the 

 overlying yellow shale he collected a few fossils, determined by Mr. Wal- 

 cott as Olenellus gilberti and 0. iddingsi. 



silver Peak. Still farther west, in a bed of yellowish brown limestone 

 with intercalated gray argillaceous shales at Silver Peak, a small collection 

 of fossils was made, which Prof. J. D. Whitney 2 placed before the Cali- 

 fornia Academy of Sciences as early as 1866. At that time he regarded 

 them as Upper Silurian or Devonian. Quite recently Mr. Walcott 3 has ex- 

 amined the collection and determined the following species: 



Archseocyathus atlanticus. Kutorgina (like K. cingulata). 



Archseocyathus, undt. sp. Hyolithes princeps. 



Ethmophyllum whitneyi. Olenellus gilberti. 

 Sti ephochetus ? sp.? 



A number of species proved to be identical with those found on the 

 coast of Labrador and the horizon is evidently the equivalent of the Georgia 

 or Lower Cambrian formation of Prospect Mountain. He also determined 

 Olenellus gilberti as closely resembling Olenellus tltowpsoni from L'Anse au 

 Loup. 



'Geographical Surveys West of One hundredth Meridian, Washington, 1875, vol. 3, p. 169. 

 J Proc. Cal. Acad. Sci., vol. 3, p. 270. 



3 Second Contribution to the studies on the Cambrian Faunas of North America. U. S. GeoL 

 Snrv. Bull. No. 30, 1886, p. 38. 



