BULLETIN 614 



SHEET 8 



GEOLOGIC AND TOPOGRAPHIC MAP 



OF THE 



SHASTA 



ROUTE 



From Seattle, Washing1;on, 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 Geolo^st 



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. 



B 



D 



F 



G 



I 



K 



L 



EXPLANATION 



Lava flows of the Cascade Range, chiei^y andesite, 

 including Sacramento River flow, with some basalt 

 and rhyolite and beds of fragmental volcanic material 

 auffs) 



Sandstones and shales containinjr some coal: lava flows 

 and much tuff (Miocene-'E&termt 



Conglomerates, sandstones, and shales containing fossils 

 (Chico formation, Upper Cretaceous) 



Chiefly altered intrusive i-ocks (serpentine and gabbro) 

 and some altered lavas (greenstones) 



Shale (Brock shale) and limestone (Hosselkus limestone) 

 underlain by thin-bedded sandstones, shales, and tuffs 

 (Pit formation) 



Tuffs (Nosoni) and limestone (McCioud) of Pennsylva- 

 nian age. underlain by tuffs, sandstone, and shale 

 <Baird) of Mississippian age 



Thin-bedded sandstones, shales, and conglomerates. With 

 pebbles containing Devonian fossils (Bragdon forma- 

 tion, of Mississippian age) 



Tertiary 



Cretaceous 



Jurassic (?) 



Triassic 



Carboniferous 



M 



Sandstones, slates, and lin 

 Devonian 



tones, in part at least 



Devonian 



N Mica schists with ancient lavas and intrusive igneous Pre-Paleozoic (?) 



roclcs 



Mineral deposits: 



/Limestone 



Gold O Quicksilver AChromite x Coal 



CALIFORNIA 



C«»5AVtD AI. 



SITtn D-* THt" U-S-GCO*^i>;CAL 



iji - 



