File:Rip-up clasts in micaceous sandstone (lower Pottsville Group, Lower Pennsylvanian; Pleasant Valley LImestone Quarry, Muskingum County, Ohio, USA) 1 (44888330432).jpg
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Rip-up clast breccia in the Pennsylvanian of Ohio, USA. (geology hammer for scale) (photo by James Cheshire) This spectacular breccia is composed of numerous rip-up clasts. It is part of the exposed stratigraphy in a quarry in western Muskingum County, Ohio. The quarry targets Maxville Limestone and crushes it for use as road gravel, fill, rip-rap, and erosion-control blocks. The Maxville here is an erosional outlier that is described in Stout (1918). The stratigraphy at this quarry includes basal Pennsylvanian sedimentary rocks disconformably overlying Mississippian Maxville Limestone: 1) ~4 to 5 feet of fissile black shale with smooth, slightly shiny concretions (paleopebbles?) 2) Sharon Conglomerate - quartz-pebble conglomerate 3) Black shale 4) Gray, non-fissile claystone with lumpy iron oxide concretions 5) Unconformity with minor paleotopography 6) Maxville Limestone - mostly lime mudstone (micritic limestone) with occasional lenses or pockets of fossil shell hash; some thin shale interbeds; one small apparent sandstone lens (= relatively thin, gray, clay-rich interval with sandy-silty grains); occasional coarsely-crystalline/coarse-grained limestone intervals with finely laminated argillaceous limestone; some slickenlined surfaces seen in the incompetent clay-rich intervals. Observed fossils include brachiopods (Composita subquadrata atrypids), bivalves, gastropods (Straparollus planodorsatus and Bellerophon sublaevis), and crinoids (even calyx material). Straparollus gastropods are common in the argillaceous intervals - they are compacted and compressed. One Straparollus fossil snail was seen with a healed shell fracture/break. Notable Pennsylvanian float samples in the section: a Lepidodendron tree trunk with nice, diamond-shaped leaf scars and the coarse-grained rip-up clast breccia shown here. Stratigraphy: lower Pottsville Group, upper Lower Pennsylvanian Locality: Pleasant Valley Limestone Quarry (along berm near southwestern pit), southwest of Dillon Lake, Hopewell Township, western Muskingum County, eastern Ohio, USA (~vicinity of 39° 58' 49.64" North latitude, 82° 08' 05.74" West longitude) Reference cited: Stout (1918) - Geology of Muskingum County. Geological Survey of Ohio, Fourth Series, Bulletin 21. 351 pp. |
| Date | |
| Source | Rip-up clasts in micaceous sandstone (lower Pottsville Group, Lower Pennsylvanian; Pleasant Valley LImestone Quarry, Muskingum County, Ohio, USA) 1 |
| 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@N05/44888330432 (archive). It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 12:03, 8 October 2019 | | 3,264 × 2,448 (6.05 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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