File:Intraclastic limestone (Columbus Limestone, Middle Devonian) 1 (40405982954).jpg
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Summary
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| Description |
Intraclastic limestone from the Devonian of Ohio, USA. (~12.7 centimeters across at its widest) The Columbus Limestone is a significant carbonate unit in the Devonian of central and northern Ohio. It's actually part of a much more widespread sheet of Devonian carbonates that extends from New York State to the American Midwest. The Columbus Limestone represents deposition in a subtropical, shallow-water, carbonate platform environment. The rocks are principally micritic limestones, fossiliferous wackestones, and fossiliferous packstones. Some chert nodules are present in the unit. Fossils are typical Paleozoic shallow marine invertebrates - favositid corals, rugose corals, stromatoporoids, brachiopods, crinoids, blastoids, bryozoans, trilobites, bivalves, gastropods, cephalopods, rostroconchs, and tentaculites. Microfossils include conodonts and charophyte oogonia. Other fossils in the Columbus Limestone include vertebrates (fish), land plants (rare), and trace fossils. Some fossil horizons in the Columbus Limestone are partially silicified. This rock sample is remarkable for having numerous small to large limestone clasts set in a limestone matrix. I have not encountered this lithology in the Columbus Limestone before. Such rocks are called intraclastic limestones - the clasts are micritic limestones (some are irregularly banded/laminated), produced by paleoerosion. Stratigraphy: Columbus Limestone, Eifelian Stage, lower Middle Devonian Locality: petroleum well lease road gravel west of Granville, Ohio, USA (derived from unknown Ohio limestone quarry) |
| Date | |
| Source | Intraclastic limestone (Columbus Limestone, Middle Devonian) 1 |
| Author | James St. John |
Licensing
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/40405982954 (archive). It was reviewed on 12 October 2019 by FlickreviewR 2 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 | 04:31, 12 October 2019 | | 3,595 × 2,269 (5.3 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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