BULLETIN 612 



SHEET No. 22 



GEOLOGIC AND TOPOGRAPHIC MAP 



OF THE 



OVEKLAND EOUTE 



From Omaha, Nebraska, to San Francisco, California 



Base compiled from United States Geological Survey Atlas Sheets, 

 from railroad alignments and profiles supplied by the Union Pacific 

 Bailroad Company and the Southern Pacific Company and from addi- 

 tional information collected with the assistance of these companies 



UNITED STATES GEOLOGICAL SURVEY 



GEORGE OTIS SMITH, DIBECTOK 



David White, Chief Geologist 



R. B. Marshall, Chief Geographer 



1915 



Bach quadrangle shoum on the map with a name in parenthesis in the 

 lower left comer is mapped in detail on the U, S, G, S. Topop^phic 

 sheet of that name. 



A 



EXPLANATION 



Stream deposits (alluvium), sediments of Lake Lahon- 

 tan, and, in upper valley of Truckee River, other lake 

 deposits 



B Glacial deposits, moraine ; Pleistocene 



Quaternary 



C 



D 



E 



Lavaa ^rhyolite, andesste, basalt, etc.), probably Mio- 

 cene, Pliocene, and later; with some interbedded vol- 

 canic ash and diatomaceous earth (Truckee formation), 

 Miocene 



Granite and other coarse-grained intrusive igneous rocks] 

 (granodiorite. grabbro, etc..*; late Jurassic or early 

 Cretaceous L 



Slate, schist, and quartzite (including Sailor Canyon 

 formation, Triassic) 



Tertiary and 

 Quaternary (?) 



Mesozoie 



Highest shore line of Lake Lahontan indicated ^us -' 



^^y - 



