File:Columnar Jointing in the Catoctin Formation.jpg
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![File:Columnar Jointing in the Catoctin Formation.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Columnar_Jointing_in_the_Catoctin_Formation.jpg/277px-Columnar_Jointing_in_the_Catoctin_Formation.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:57, 19 March 2021 | ![]() | 450 × 974 (89 KB) | Mannepuckett | 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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