GEOLOGIC AND TOPOGRAPHIC MAP 



OF THE 



SHASTA AND COAST 



ROUTES 



From Seattle, Washington, to San Francisco, California 



and 



From Los Angeles, California, to San Francisco, California 



Base compiled from United States Geological Survey Atlas 

 Sheets, from railroad alignments and profiles supplied by 

 the Southern Pacific Company and from additional informa- 

 tion collected with the assistance of this company 



UNITED STATES GEOLOGICAL SURVEY 



GEORGE OTIS SMITH, DIRECTOR 



David White, Chief Geologist 



R. B. Marshall, Chief Geographer 



1915 



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

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

 Sheet of that name. 



EXPLANATION 



^ * • + ** 



MAP SHOWlNe GEOLOGIC FORMATIONS AiJONG THE SOUTH SHORE 



BfKf. 



SW. 



a. 



I" 



o 



NE. 



AVX nN v. s X X 



Tb 



Thi TK 



-• ♦* + 



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tf^;^■-■^ ■::■■.:■ ■v./.^v ■■■■:. -..■.,. 



t 



^ 



i^ 



o 



I Mile 



BULLETIN 614 



SHEET 13 



IZ3" 



1 



EXPLANATION 



m 



Stream deposits (alluvium), sand dunes, and beach sands 



Fresh-water gravels, sands, and clays (Santa Clara for-H 

 mation, earb^ Quaternary and Pliocene) ; marine clay, ! 

 sandstone, and conglomerate (Merced formation, Plio-f 

 cene); and stratfied light-colored pumice CPinole tuff, 

 Pliocene) 



Light-colored soft sandstone and .chalky bituminous 

 shale (San Pablo formation and Monterey group); 

 Miocene 



Hard sandstone above (Tejon formation); chiefly con- 

 glomei-ate with sandstone; some shale and thin lime- 

 stone (Martinez formation) below; Eocene 



Lava flows (basalt and rhyolite) 



Massive yellowish sandstone with conglomerate member 

 below (Chico formation, Upper Cretaceous),^ underlain 

 by calcareous and arenaceous shale (Knox'/ille forma- 

 tion, Lower Cretaceous) 



r 



Chiefly intrusive rocks (basalt, diabase, gabbro, perido- 

 tite, pyroxenite, serpentine); Jurassic (?) 



Sandstones with subordinate shvles, locally alternating 

 with varicolored radioiarian cherts and some limestone ; 

 local schists due to metamqrphism on contact of 

 igneous rocks (Franciscan group) : Jurassic (?) 



Granite (quartz diorite) 



Scale 500,000 

 Approximately 8 miies to 1 inch 



S 10 



122 30' 



CALIFORNIA 



Quaternary 



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o, 



Quaternary 

 and Tertiary 



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Tertiary 



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iRE ISLAM 

 NAVY YARD 



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5 \Q 15 20 25 



■ ■ T . . ■ . I ■ ■ ■ > * 1 ■ ■ ■ I t 1 1 t I t T I 



Contour interval 200 feet 



ELEVATtONS IN FEET ABOVE MEAN SEA LEVEL 



Th€ distances from Los Angehs C-Z'/om/a] ^^^ ^^^^^ ^^^^ ^^ ^.^^^ 

 r/»« d/s(«nce5 /rom Seattie. WtsAington. 



The crossties on the railroads are spaced I mile apart 



30 Kilometers 



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Ocea t\ 



Shone 



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Chabot 



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Vtsitacion 



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1 22^0' 



No. 6 A 



J4an>V^"> AK r »*<if*TEtJ B^ TKE U »S.<-COLC^iC*M- '^IJUVtV 



SECTION SHOWING 5TRUCTU 



