File:Possible mudcracks capping nonmarine limestone (Nineveh Limestone, Greene Formation, Lower Permian; Clark Hill section, Long Ridge, Monroe County, Ohio, USA) 2 (29675797791).jpg
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Nonmarine limestone (bedding plane view) from the Permian of Ohio, USA. (acid bottle for scale) The Upper Pennsylvanian to Lower Permian Dunkard Group of Ohio contains the youngest bedrock in the entire state. The unit consists of two stratigraphic formations: the Washington Formation (below) and the Greene Formation (above). This is a cyclothemic, nonmarine succession principally composed of shales, sandstones, lacustrine limestones, and thin coal beds. The rock shown above is from the Nineveh Limestone, a nonmarine carbonate unit in the Greene Formation (Lower Permian). These sediments were deposited in an ancient lake. The uppermost limestone bed of the Nineveh consists of cryptalgally-laminated micrite and dismicrite with fossil ostracods and ostracod vugs. The float sample shown above is capped by what appears to be mudcracks (desiccation cracks). Evidence for subaerial exposure and drying out of sediments has been reported in the literature for nonmarine limestone intervals in the Dunkard Group and the underlying Monongahela Group. These don't exactly look like the unambiguous mudcracks I have seen elsewhere in the rock record - they may be dissolution-enhanced fractures (?). Stratigraphy: upper series of the Nineveh Limestone, unit GR16 of Cross et al. (1950), Greene Formation, upper Dunkard Group, Lower Permian Locality: Clark Hill section - roadcut on the southeastern side of Long Ridge Road, south of Oppossum Creek, south-southeast of the town of Clarington, southeastern Alum Township, eastern Monroe County, eastern Ohio, USA (GPS: 39° 43.676’ North latitude, 80° 51.018’ West longitude) Reference cited: Cross et al. (1950) - Field guide for the special field conference on the stratigraphy, sedimentation and nomenclature of the Upper Pennsylvanian and Lower Permian strata (Monongahela, Washington and Greene Series) in the northern portion of the Dunkard Basin of Ohio, West Virginia and Pennsylvania. 107 pp. |
| Date | |
| Source | Possible mudcracks capping nonmarine limestone (Nineveh Limestone, Greene Formation, Lower Permian; Clark Hill section, Long Ridge, Monroe County, Ohio, USA) 2 |
| 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@N05/29675797791 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 01:31, 6 December 2019 | | 3,092 × 2,816 (3.65 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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