File:Dolomitic concretion (Ohio Shale, Upper Devonian; Groveport, Ohio, USA).jpg
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English: Dolomitic concretion from the Devonian of Ohio, USA.
Concretions are post-depositional structures found in some sedimentary successions, particularly in shales. They vary in mineralogy, size, and shape, but often have slightly flattened spheroidal shapes. They typically form by post-depositional mineralization around some nucleus (a rock fragment or fossil fragment). Portions of the Late Devonian-aged Ohio Shale succession are famous for having large, subspherical concretions. Analyses have shown that they are multimineralic and are dominated by carbonate minerals (calcite, dolomite), silicate minerals (quartz, clay minerals), sulfides (pyrite), sulfates (barite), and organic carbon (Criss et al., 1988). Some are composite concretions - two or more individual masses have coalesced. Stratigraphy: Ohio Shale (probably the Huron Member), Upper Devonian Locality: unspecified locality at or near the town of Groveport, central Ohio, USA Reference cited: Criss et al. (1988) - An organic origin for the carbonate concretions of the Ohio Shale. United States Geological Survey Bulletin 1836. 21 pp. (pubs.usgs.gov/bul/1836/report.pdf) |
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| Source | https://www.flickr.com/photos/47445767@N05/53665627366/ |
| 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@N05/53665627366. It was reviewed on 21 April 2024 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 17:00, 21 April 2024 | | 2,317 × 2,323 (3.96 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53665627366/ with UploadWizard |
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