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 



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

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

 Sheet of that name. 



BULLETIN 614 



124- 



\23'3o 



Sheet No. 5 



23* 



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EXPLANATION 



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Yoncaila 

 rL.3a3 





JM 



Stream depos 



Quaterna 



Lava flows from the Cascade Range, chiefly andesitea. 

 with some basalt and rhyolite and beds of fragrmental 

 volcanic material (tuff) 



■ 



Sandstone (Tyee sandstone, Eocene) 



Chiefly thin sandstones and shales (Umpqua formation, 

 Eocene) 



Lava flows (basalt) 



Conglomerate, sandstone, shale, and limestone (Myrtle 

 formation, Lower Cretaceous) 



Altered intrusive rocks (serpentine and greenstone) 



Flinty beds, consisting chiefly of siliceous skeletons of 

 microscopic animals (Radiolaria), and schists owing 

 their present character to changes effected by the 

 intrusion of igneous rocks 



Sandstones and shales (Dothan formation) 



Slates (Galice formation) containing fossils like those of 

 the Mariposa slate of California 



Tertiary 



A , 



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tee 



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l~' -'.1^ . f* , Jh" 



^(cUwy 



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lN^ 



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«« \ 



l.ri' 



XT. 



Cretaceous 



urassic 





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utherl 



IV^ 



Jurassic 



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-3500 



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Scale 500,006 

 Approximately 8 miles to 1 inch 



1 ■ I 1 I ' ■ 



Alexan(i 



Butte 



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20Mil 



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rxj 



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S \0 15 



25 30 Kilometer^ 



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Contour interval 200 feet 



ELEVATIONS /N F££T ABOVE MEAN SEA CfVETL 



Th€ distances from Seattle. Washington, are shown every JO miles 

 Th* rm*sf;>s ofl the rikilroads are spaced I mile apart 



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124^ 



S-^ee'A A/o-7 



123*30' 



123 



SHEET 6 



EjmftFaAVBc >v 



43- 



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