BULLETIN 614 



SHEET 4A 



GEOLOGIC AND TOPOGRAPHIC MAP 



OF THE 



COAST ROUTE 



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From Los Angeles, California, to San Francisco, California 



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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 



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UNITED STATES GEOLOGICAL SURVEY 



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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 cornsr is mapped in detail on the U. S. G. S. Topographic 

 Sheet of that name. 



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EXPLANATION 

 Stream deposits (gravel and fine alluvium) 

 Marine terrace deposits and dune sand 



Conglomerate, sandy and marly clays vPaso Robles for- 

 mation), sandstone, flinty shale, and volcanic ash 

 (Pismo and Santa Margarita formations) 



Siliceous and bituminous diatomaceous shales of Mon-1 

 terey group underlain by sandstone and conglomerate)- 

 cVaqueros sandstone of Monterey group; J 



Lava flows and fragmental volcanic material (rhyolite 

 tuff; in shale of Monterey group, with various intrusive 

 dike rocks 



Sandstone with some conglomerato and shale \ Chico for- 

 mation), underlain by dark thin-bedded s'andstones 

 (Knoxville formation') 



Intrusive igneous rocks and- derivatives : diabase and 

 serpentine' (pre-Chico but post-Franciscan) 



Sandstone, conglomerate, and shale, with varicolored 

 thin-bedded flinty rocks ' radiolarian cherti. arid schists 

 owing their present character to changes produced by 

 intrusion of igneous ix>cks (contact metamorphism^ 



. (Franciscan group i 



Granite 



Quaternar;, 



Early Quaternary, 

 Pliocene, and 

 Miocene 



Miocene 



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Chiefly Miocene 



Cretaceous 



Jurassic (?; 



Jurassic (?) 



Pre-Jurassic(^) 



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Scale 500;OM 

 Approximately 8 miles to 1 inch 



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15 20MiIes 



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I20'30' CALIFORNIA 



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Contour interval 200 feet 



ELEVATIONS IN FEET ABOVE MEAN SEA LEVEL 



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The distances from Los A/igeies. California are shown Bvery iO m^ies 

 The crossfies on the railroads are spitced 1 mile apart 



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