California ยท State GeologyExplorer
Detailed State Geology
California's most detailed published geology, joined from state geological survey and USGS maps: each area shows the best map available, from 1:24,000 quadrangles to 1:1,000,000 state maps. Rock units are coloured by type and age, with contacts, faults and strike and dip. Open the filter to search the units or show only the gold host rocks.
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Detector Maps: maps for finding gold, coins and relics. About the app