File:Grass Valley Geologic Map.jpg

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Original file (1,123 × 885 pixels, file size: 332 KB, MIME type: image/jpeg)

Captions

Captions

Grass Valley Geologic Map, showing the location of the North star, Empire, and Maryland mines

Summary

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Description
English: Grass Valley Geologic Map, where grd is granodiorite, pd is porphyrite and diabase, gb is gabbro, s is serpentine, and Ta is andesite
Date
Source The gold quartz veins of Grass Valley, California Professional Paper 194, https://pubs.er.usgs.gov/publication/pp194
Author W. D. Johnston Jr.

Licensing

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Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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current22:30, 24 March 2022Thumbnail for version as of 22:30, 24 March 20221,123 × 885 (332 KB)Pi3.124 (talk | contribs)Uploaded a work by W. D. Johnston Jr. from The gold quartz veins of Grass Valley, California Professional Paper 194, https://pubs.er.usgs.gov/publication/pp194 with UploadWizard

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