Image: Grass Valley Geologic Map
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Description: Grass Valley Geologic Map, where grd is granodiorite, pd is porphyrite and diabase, gb is gabbro, s is serpentine, and Ta is andesite
Title: Grass Valley Geologic Map
Credit: The gold quartz veins of Grass Valley, California Professional Paper 194, https://pubs.er.usgs.gov/publication/pp194
Author: W. D. Johnston Jr.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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