File:Ironstone concretion (lower Pottsville Group, Lower Pennsylvanian; Pleasant Valley Limestone Quarry, Muskingum County, Ohio, USA) 1 (30226085737).jpg
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[edit]DescriptionIronstone concretion (lower Pottsville Group, Lower Pennsylvanian; Pleasant Valley Limestone Quarry, Muskingum County, Ohio, USA) 1 (30226085737).jpg |
Ironstone concretion from the Pennsylvanian of Ohio, USA. (millimeter scale) This concretion is from 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). Lithologically, the specimen is ironstone. Apparent carbonized fossil plant material is present on the surface, plus possible fault slickenlines (click on the photo to zoom in). 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 a coarse-grained, rip-up clast breccia. Stratigraphy: black shale interval in the lower Pottsville Group (about 10 feet above the Maxville-Pottsville disconformity), upper Lower Pennsylvanian Locality: Pleasant Valley Limestone Quarry, 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 | Ironstone concretion (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@N05/30226085737 (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. |
8 October 2019
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current | 12:04, 8 October 2019 | 2,047 × 1,705 (2.45 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Date and time of data generation | 17:07, 3 October 2018 |
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Horizontal resolution | 180 dpi |
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File change date and time | 23:36, 4 October 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 17:07, 3 October 2018 |
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APEX aperture | 3.34375 |
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Maximum land aperture | 3.34375 APEX (f/3.19) |
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Scene capture type | Portrait |
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Date metadata was last modified | 19:36, 4 October 2018 |
Unique ID of original document | EB7050733F07066E721C9C7835CED489 |