BULLETIN 612 



GEOLOGIC AND TOPOGRAPHIC MAP 



OF THE 



OVERLAND ROUTE 



From Omaha, Nebraska, to San Francisco, California 



Base compiled from TTuitea States Geological Survey Atlas Sheets 

 from railroad aliguments and profiles supplied by the Union Paclflc 

 Railroad Company and the Southern Pacific Company and from addi- 

 tional Information collected with the assistance of these companies 



U]C^1TED STATES GEOLOGICAL SURVEY 



GEORaE OTIS SMITH, DIRECTOR 



David White, Chief Oeologist 



R. B. Marshall, Chief Geographer 



1915 



Each quadrangle shoum on the map with a name in par^kesis in the 

 lower left comer is mapped in detail on the £/. 5. G. 5. Topographic 

 sheet of that name. 



SHEET NO.19 



117- 



amFfeak 



16*30 



NEVADA 



EXPLANATION 

 A Stream deposits 'alluvium) and wash from hillsides 



Quaternary 



B 



C 



Soft white friable sandstones, conglomerate, and volcanic 

 ash Humboldt formation); Pliocene 



Lava irhyolite and andesite"* : probably Miocene or 

 Pliocene 



D Lava 'basalt;; probably Miocene or Pliocene 



Tertiary 



E 



Granite and other coarse-grained 

 Cretaceous 



rocks ; probably 



Contour interval 200 feet 



ELEVATIONS IN FEET ABOVE MEAN SEA LEVEL 



The distances from Omaha, Nebraska, are shewn every JO miles 

 The crossties on the railroads arc spaced I mile aiygrt 



