GEOLOGIC MAPS AND NOTES ALONG HIGHWAY 49 BOWEN AND CRIPPEN 



75 



to Gross Valley 



to Downievillc 



to No. Columbia 







Jurassic 

 and/or 

 Triessic 



Jurassic 



to 

 Poltotoic 



EXPLANATION 



Oal Alluvii 



Qm Glaciol 



TV erate Includes basalt and 

 Table Mtn latite 



Tvr Rhyohte tuff and ash 



Old nver deposits. Chiefly 

 g Eocene quartz grovels, 

 gold-bearing 



ard Granitic rocks- granite 

 to diorite 



sp 



Ultra-basic racks 

 chiefly serpentine 



QP Porphyntic rochs quartj 

 b. and hornblende porphyries 



Mela-sediments. Chiefly 

 J m Moriposa formation slate, 

 graywacke, etc. 



j Meta-volconics. Chiefly Log- 

 town Ridge meto-andesite 



Milton formation, tyff, red 

 J RfP slate, quaMzite, limestone, 

 and conglomerate 



Meta-volcanics of 

 nw 



uncertain age 



Calaveros formation mica- 

 Cc schist, phyihie, quartzite, 

 clay slate, argillite, etc 



Note-Blank pattern box indicates 

 rock type is not shown on map. 



MAP SYMBOLS FOR 

 BUILDING STONE 



CU Adobe 



Granite, granodiorite 

 Greenstone (meta-andesile) 



Q Limestone 



53 Rhyolite tuff 



53 Schist 



S3 Serpentine and talc schist 



Efl Slate 



53 Tuffaceous sandstone 



53 Soapstone 



IXI Unclassified rock 



Quarry site 



MAP 8 

 AUBURN-NORTH SAN JUAN 



