BULLETIN 512 



SHEET No. 24 



GEOLOGIC AND TOPOGRAFHIO MAP 



OF THE 



OVERLAND ROUTE 



■ 



From Omaha, Nebraska, to San Francisco, California 



r 



Base compiled from United States Geological Survey Atlas Slieets, 

 from railroad alignments and profiles supplied Dy the Union Pacific 

 Railroad Company and the Southern Pacific Company and from addi- 

 tional information collected with the assistance of these companies 



UNITED STATES GEOLOGICAL SUEYEY 



GEORGE OTIS SMITH, DIRECTOR 



David White, Chief Geologist 



R. B. Marshall, Chief Geographer 



1915 



Each quadrangle shorn on the map with a name in parenthesis in the 

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

 sheet of that name. 



12130' 



ShsefAhPS 



CALIFORNIA 



38 



30' 



Quaternary 



Fragmental lavas v chiefly andesitei; Neocene 



Clays, sards, and g^ravel with some coal bwls 

 mation): Eocene 



Granite and diabase or amphiholite and related intrusive 

 rocks ; late Jurassic or early CreUceous 



Slates, saijdstone, and cynglomerate f Mariposa slater. 

 Jurassic 



Tertiarv 



Mesozoic 



Coast Rang-es 

 Modern stream deposits i alluvium I 



Fresh-water conglomerate, sandatone, clay, and lime- 

 stone 1 Orinda formation): stratified light-colored 

 pumice (Pinole tuff; ; Pliocene 



Sandstones and shales, mostly light colored, (Mont^re:- 

 ^roup and San Pablo fomr^ation at top) ; Miocene 



Sandstone with some shale and conglomerate 'Te ion for- 

 mation above and Martinez formation below; ; Eocene 



Lava fiows (basalt, rhyoiite . and rhyolitic tuff' 



Massive yellovtish sandstone and clay shale with con- 

 grlomerale at bottom Chico formation. Upper Creta- 

 ceous ' underlain by dark shale ^ Knox . ;> shale. I»wer 

 Cretaceous) 



viuateriiATy 



38 



V Tertiarv 



Mesozoic 



12130' 



i 



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