File:Greenstone dikes in basement rocks.jpg
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English: Top photograph: Dike on Ridge Trail, Old Rag Mountain, about 0.4 mile northeast of the summit. Wallrock is Old Rag Granite of Furcron (1934). Bottom photograph: Dike at west side of north portal of Marys Rock Tunnel, mile 32.1, Skyline Drive. Wallrock is granodiorite. |
| Date | |
| Source | https://www.nps.gov/parkhistory/online_books/geology/publications/bul/1265/sec2.htm |
| Author | USGS |
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This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information. |  |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 13:57, 19 March 2021 | | 450 × 1,208 (65 KB) | Mannepuckett (talk | contribs) | Uploaded a work by USGS from https://www.nps.gov/parkhistory/online_books/geology/publications/bul/1265/sec2.htm with UploadWizard |
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