206 



GEOLOGY OF THE EUKEKA DLSTKICT. 



fault brings the Lower Coal-measures up against the Pogonip, oi'ganic 

 remains characteristic of both ejjochs being found within a few hundred 

 yards of each other, with the intervening space occupied mainly by 

 igneous extrusions along the fnult-line. Here, however, they have been 

 brought into their present position by prolbund orographic displacement. 



The Wasatch and Kanab Sections.— Tile Wasatcll Range, wllich shutS in the 



Grreat Basin on the east, combines, in a marked manner, many of the geo- 

 logical characters of both the Rocky Mountains and the Basin ranges. In 

 structure, however, it is closely related in its essential features to the ranges 

 of Utah and Nevada. There is exposed in the range a very remarkable 

 section of confonnable beds, extending through 30,000 feet of sediments 

 and exhibiting nearly every geological period fnmi Lower Cambrian to 

 Permian. For the pui-joose of compai-ison a section constructed by the 

 Greological Exploration of the Fortieth Parallel is reproduced, as it shows 

 not only certain resemblances, but also striking differences in the sequence 

 beds from the section as exposed at Eureka : 



Wasatch section, Utah: 3(),<)00 feet; conformable. 



Permian, 650 feet . 



Carboniferous, 

 14,000 feet 



Devonian, 2,400 feet. < 



Silurian, 1,000 feet ... 

 Cambrian, 12,000 feet . 



Permian 



Upper Coal-measure limestone. 



Weber quartzite 



Lower Coal-meas- 1 

 iu'6 limestone . . [ Wasatch 



Wavorly I limestone 



Nevada limestone J 



Ogdeu quartzite. 

 Ute limestone . . . 



650 

 2,000 

 6,000 



7,400 



1,000 

 1,000 



12, 000 



Clays, marls, and limestones; shal- 

 low. 



Blue and dvah limestones; passing 

 into sandstones. 



Compact sandstone and quartzite; 

 often r.dili^h; ii.tciv.ilalions of 

 lime, .■iii;illiti-s, iiiid i-c'iii;loiiici:it('. 



Heavy \<r>UU-il l.lur :iii.l 'uniy lime- 

 stone, darker near the iiase, with 

 siliceous admixture, especially 

 near the top. 



Pure quartzite, with conglomerate. 



Compact, or shaly, siliceous lime- 

 stone. 



Siliceous schists and slates, quartz- 

 ites. 



In the Wasatch section the 12,000 feet of metamorphosed schists, 

 slates, and quartzites probably occur below the Camlirian beds as exposed 

 at Eureka, except so far as they ma)^ be represented in the upper members 

 by the Prospect Mountain quartzite, while the great thickness of Cambrian 

 limestones and shales of the Eureka section is included within the 1,000 

 feet of Ute limestone in the former section. Again, at Eureka the Permian 

 at the top of the section is wholly wanting and the Upper Coal-measures, 

 which in other parts of Neviida attain a development of nearly 2,000 feet, 



