File:Black mudshale with glacial scratches 3 (27243862958).jpg
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Original file (2,702 × 2,125 pixels, file size: 4.47 MB, MIME type: image/jpeg)
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Summary
| Description |
(~3.65 centimeters across at its widest) This specimen is a clast from an anthropogenically-disturbed glacial deposit at a petroleum wellsite in east-central Ohio. The rock itself is a black mudshale derived from the Ohio Shale, a thick Upper Devonian unit representing deposition in a moderately deep, anoxic seafloor environment. It was eroded from an outcrop during the Pleistocene by a continental glacier (the near-southernmost Laurentide Ice Sheet), then deposited as the glacier moved or melted away. Under low-angle lighting, numerous thin scratches are evident - these are glacial striations, formed by gravel abrading gravel within the moving glacial ice. (There is a possibility that the scratches are partially or entirely anthropogenic, formed by bulldozer disturbances of the deposit as the wellsite was being prepared. Shale is a soft rock. However, I suspect the scratches are glacial in origin.) Stratigraphy: Ohio Shale, Famennian Stage, upper Upper Devonian Locality: VanWinkle Unit # 1 wellsite (permit # 34089261880000) (804' SL, 1794' EL, northeastern quarter of township), west of Granville, St. Albans Township, Licking County, east-central Ohio, USA (40° 04' 55.13" North latitude, 82° 34' 38.00" West longitude) |
| Date | |
| Source | Black mudshale with glacial scratches 3 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/27243862958 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:06, 7 December 2019 | | 2,702 × 2,125 (4.47 MB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
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