File:Intraclastic bioclastic dolostone (upper Boggs Limestone, middle Pottsville Group, lower Middle Pennsylvanian; subcrop in Symmes Creek, northern Muskingum County, eastern Ohio, USA) 2 (26053406396).jpg
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Intraclastic bioclastic dolostone from the Pennsylvanian of eastern Ohio, USA. (~7.8 cm across at its widest near the base) The Pottsville Group is a Pennsylvanian-aged cyclothemic succession in eastern Ohio that contains nonmarine shales, marine shales, siltstones, sandstones, coals, marine limestones, and chert ("flint"). The lower Pottsville dates to the late Early Pennsylvanian. The upper part dates to the early Middle Pennsylvanian. The Lower-Middle Pennsylvanian boundary is apparently somewhere near the Boggs Member (?). The Boggs Member is a relatively thin stratigraphic interval. It typically consists of marine fossiliferous limestones, dominated by brachiopods and crinoid ossicles. Significant lateral lithologic variation is present - Boggs lithologies range from fossiliferous limestone to intraclastic limestone to ferruginous chert to "flint" to dolostone. In places, it has a relatively high component of disseminated pyrite. In other places, it is relatively rich in black manganese oxide(s). Minerals observed in the Boggs Limestone interval: calcite, dolomite, glauconite, goethite, gypsum, limonite, pyrite, sphalerite, turgite, vivianite, wad. This sample is from the upper part of the Boggs Limestone bed. It's a vuggy bioclastic dolostone (dolomitized bioclastic limestone) with dolostone intraclasts. Disseminated pyrite, calcitic brachiopod shells, and calcitic crinoid stem columnals are also present. Stratigraphy: upper Boggs Limestone, middle Pottsville Group, lower Atokan Stage, lower Middle Pennsylvanian Locality: subaqueous outcrop in Symmes Creek, just east of Mollies Rock Road bridge (County Highway 40 bridge) & just east of the confluence with the North Branch of Symmes Creek, ~1.1 miles northeast of the Muskingum River, ~4 miles southeast of the town of Dresden, south-central Madison Township, northern Muskingum County, eastern Ohio, USA (40° 04.992’ North latitude, 81° 57.186’ West longitude) |
| Date | |
| Source | Intraclastic bioclastic dolostone (upper Boggs Limestone, middle Pottsville Group, lower Middle Pennsylvanian; subcrop in Symmes Creek, northern Muskingum County, eastern 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@N05/26053406396. It was reviewed on 24 June 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 17:15, 24 June 2017 | | 3,617 × 2,266 (5.63 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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