glassmtnmap

Pinkish units are part of the Sonoma Volcanics (Tsa, Tsr, etc.), gray units are Franciscan rocks, units with “Q” are recent sediments. From USGS Scientific Investigations Map 2956.

Download Original: 600 × 350 Geological Outings Around the Bay: Napa Glass Mountain

glassmtnmap 2 February,2012Andrew Alden