BULLETIN 614 



SHEET 6A 



GEOLOGIC AND TOPOGRAPHIC MAP 



OF THE 



COAST 



ROUTE 



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 Compan^^ 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 

 hwer left comer is mapped in detail on the U. S. G. S. Topographic 

 Sheet of that name. 



A 



B 



C 



EXPLANATION 



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



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

 mation) ; marine clay, sandstone, and conglomerate 

 {Merced formation) 



Conglomerate, sandstone, and shale (Purisima and Santa 

 Margarita formations), underlain by chalky bituminous 

 shale, in places containing flinty layers, and by raas- 

 siv*3 sandstone (upfK-r part of Monterey group) : under- 

 lain by heavy -bedded sandstone and conglomerate 

 (Vaqueros sandstone) of Monterey group * Miocene). 

 At base clayey shales with some fine-grained sandstone . 

 (San Lorenzo formation, OUgocene) J 



Quaternary 



Early Qua- 

 ternary and 

 Pliocene 



Miocene 



and 



Oligocene 



D 



Hard sandstone (Tejon formation); 

 erate with sandstone; underlain 

 limestone (Martinez forroation) 



chiefly coEgiom-] 

 by shale and thin>- 



Eocene 



E Lava flows (basalt and rhyoHte) 



Tertiary 



F 



Massive yellowish sandstone with ccmgiomerate at bot-1 

 torn (Chico formation. Upper CreUceoua), underlain I 

 by timy and sandy shale (Knoxvilte formation. \jow& | 



Cietaoeous) 



Cretaceous 



J 



G 



ntrosi ve rocks and derivatives ( diabase, 



pyroxeaite, s^Tpentine) 



g&bbro, 



JUHL. . Ic ( ?) 



* r* 



**. 



H 



indstx«i€S with subordinate ahaies and varicofcred thin 

 bedded flinty rocks (rad^larian cherts) and some lira^ 

 stone. Locally changed to scbisti n^tr contact with I 

 iimeous rocte. (Franciscan imwp) J 



Jurassic (?) 



I 



White to light-gray 

 schist 



J Granite (quartz diot 



tallire limestone and r~--aceoua Pre-Jurassic{?) 



Pre-Jurassici?) 



f<j!»i'rr.r^ p^ tHC ' 



