File:Concretion with calcite-filled crack-and-heal fractures (Pottsville Group, Lower Pennsylvanian; Rt. 16 roadcut at the eastern end of Irish Ridge, Muskingum County, Ohio, USA) 1 (25885444073).jpg
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| Description |
Concretion from the Pennsylvanian of Ohio, USA. (~12.2 cm across at its widest) This is a calcium carbonate (limestone) concretion that was hosted in mudshale. The medium to dark gray area is a crack surface showing the unweathered appearance of the concretion interior. The dirty yellowish-colored material on much of the rest of the rock is limonite staining produced by weathering. Limonite is a hydrous iron hydroxy-oxide mineral. The two prominent ridges (extending from upper right to lower left) are calcite-filled fractures. Many concretions have experienced fracturing, followed by mineralization in the fractures. This process may be repeated many times and can be referred to as "crack-and-heal" - the ridges are healed fractures. Stratigraphy: talus from the lower Pottsville Group (apparently from a little below the Poverty Run Limestone), upper Morrowan Stage, upper Lower Pennsylvanian Locality: loose piece from Trinway West 0 Outcrop - roadcut on the northern side of Rt. 16, immediately west of the Rt. 16-Rt. 60 intersection, southern side of the eastern end of Irish Ridge, northern Cass Township, northwestern Muskingum County, eastern Ohio, USA (40° 09’ 22.48” North latitude, 82° 02’ 03.32” West longitude) |
| Date | |
| Source | Concretion with calcite-filled crack-and-heal fractures (Pottsville Group, Lower Pennsylvanian; Rt. 16 roadcut at the eastern end of Irish Ridge, 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@N05/25885444073. 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 | |
|---|---|---|---|---|---|
| current | 17:21, 24 June 2017 | | 3,623 × 2,530 (5.36 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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