BULLETIN 614 



SHEET 9 



GEOLOGIC AND TOPOGRAPHIC MAP 



OF THE 



SHASTA 



ROUTE 



From Seattle, Washington, 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 



Eaoh 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 

 A Stream deposits (aliuvium and Red Bluff formation) 



Quaternary 



B 



C 



I^va flows (chiefly basalt) east of the Sacramento 

 Valley and andesite in the upper Sacramento Canyon, 

 flosv from Mount Shasta 



Tuffs (Tuscan tuff. Pliocene); gravels, sands, and clays 

 (lone formation, Eocene) (stippled pattern) 



Tertiary 



F 



Conglomerates, sandstones, and shales: ('Chico. 

 town, and Knoxville formations) containing 



ceous fossils 



Horse 

 Creta 



Cretaceous 



G 



Sandstones and shales 

 material ( Potem and 

 Jura !: fossils 



composed largely of volcanic 

 Modin formations), containing 



Jurassic 



I 



Shale (Brock shale) and limestone (Hosselkus limestone) 

 underlain by thin-bedded sandstones, shales, and tuffs 

 (Pit formation) 



Triassic 



J Lavas, tuffs, and granular Intrusive rocks of Triassic Mesozoic 



to Cretaceous aire 



K 



L 



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

 nian age. underlain by tutfs, sandstone, and shale 

 (Baird) of Mississippian age 



Thin-bedded sandstones, shales, and conglomerate; 

 pebbles contain Devonian fossils (Bragdon formation, 

 of Mississippian age) 



Carboniferous 



M Sandstone, shales, and limestone (Kennett formation) 



N Altered lavas and tuffs (meta-andesite) 



Devonian 

 Pre- Devonian 



Mineral deposits: 

 ^ Chromium and iron predominant 



Gold predominant 



A Copper predominant 



Limestone ; represented by soad red color 



-' fc. tj--s,rjEiji^^ '"-' -■" 



