File:Grass Valley Geologic Map.jpg
![File:Grass Valley Geologic Map.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Grass_Valley_Geologic_Map.jpg/761px-Grass_Valley_Geologic_Map.jpg?20220324223049)
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Summary
[edit]DescriptionGrass Valley Geologic Map.jpg |
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
[edit]Public domainPublic domainfalsefalse |
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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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current | 22:30, 24 March 2022 | ![]() | 1,123 × 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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Author | Matthew Brzostowski |
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Date and time of data generation | 17:17, 24 March 2022 |
Date and time of digitizing | 17:17, 24 March 2022 |
DateTimeOriginal subseconds | 02 |
DateTimeDigitized subseconds | 02 |