BULLETIN 612 



SHEET No. 21 



118 3o' Shee^ /^o.20 



NEVADA 



GEOLOGIC AND TOPOGEAPHIC MAP 



OF THE 



OVEELAND EOTJTE 



From Omalia, Nebraska, to San Francisco, California 



Base compiled from United States Greological Survey J^tlas Sheets, 

 from railroad alignments and profiles supplied by the Union Paclflc 

 Kailroad Company and the Southern Pacific Company and from addi- 

 tional information collected with the assistance of these companies 



UNITED STATES GEOLOGICAL SURVEY 



G-EOEQE OTIS SMITH, DIRECTOR 



David White, Chief Geologist 



B. B. Marshall, Chief Geographer 



1915 



Bach quadrangle shown on the map with a na^r.e in parerthesis in the 

 lower left comer is mapped in detail on the U- S. G. S. Topographic 

 shest of that nayne. 



EXPLANATION 



Stream deposits (alluvium), and sediments of J^ke 

 Lahontan 



Lavas ' basalt andesite. rhyolite. etc.),probably Miocene, 

 Pliocene, and possibly later; with some interbedded 

 volcanic ash and diatomaceous earth (Truckee forma- 

 tion}, Miocene 



Granite and other coarse-grained intrusive igneous 

 rocks ; probably Cretaceous 



Shales with Wnieatone at the base; Jurassic 



Limestone and quartzite in thick alternating layers (Star 

 Peak formation) ; Triassic 



Lavas and tuffs (mostly rhyoiitic) interlayered with 

 shales and limestone (Koipato formation) ; Triassic 



Quaternary 



