File:Columnar Jointing in the Catoctin Formation.jpg
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English: Columnar jointing in greenstone. Top photograph: Small wavy columns at top of cliff above the Appalachian Trail about 0.15 mile north of Hawksbill Gap. Bottom photograph: Large column along the Appalachian Trail about 200 feet south of Little Stony Man parking area. The column is cut by cleavage which dips east, away from the observer. Note that the segment of the column above each cleavage plane is offset westward from the segment beneath as a result of movement during formation of the cleavage. Column is approximately 2 feet in diameter. |
| 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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| current | 13:57, 19 March 2021 | | 450 × 974 (89 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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