GEOLOGIC MAPS AND NOTES ALONG HIGHWAY 49 BOWEN AND CRIPPEN 



39 



MAP I 

 MARIPOSA-COULTERVILLE 



EXPLANATION 

 Oal Alluv 



Andesite breccia and conglom- 

 erate Includes basalt and 

 Table Mtn latite 



Tvr Rhyolite tuff and ash 



Old nver deposits Chiefly 

 Eocene quartz gravels, 

 gold-bearing 



Granitic rocks- granite 



Ultra-basic rocks 

 chiefly serpentine 



Porphyritic rocks quartz 

 and hornblende porphyries 



Meta-sediments. Chiefly 

 Moriposo formation-slate, 

 graywacke, etc. 



Jmv Meta ~ volcanics Chiefly Log- 

 town Ridge meta-ondesite 



Milton formation tuff, red 

 slate, quortzite, limestone, 

 and conglomerate 



Meta-volcanics of 

 uncertain age 



Calaveros formation mica- 

 schist, phyllite, quartzite, 

 cloy slate, argiilite, etc. 



MAP SYMBOLS 



Lode and drift mines 



Placer and hydraulic (hyd) 

 (Mine names in red) 



Calaveras limestone 



Highway 49 



Historical markers 



Town buildings and roads 



Note- Blank pattern box indicates 

 rock type is not shown on map. 



MAP SYMBOLS FOR 



BUILDING STONE 

 Adobe 



Granite, granodiorite 

 Greenstone (meta-andesite) 

 Limestone 

 Rhyolite tuff 

 Schist 



Serpentine and talc schist 

 Slate 



Tufaceous sandstone 

 Soapstone 

 Unclassified rock 

 Quarry site 





