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File:Chert nodule horizon in fossiliferous limestones (Columbus Limestone, Middle Devonian; Marblecliff Quarry, Hilliard, Ohio, USA) (48384566297).jpg

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Chert nodule horizon in limestone in the Devonian of Ohio, USA.

The Columbus Limestone is a significant carbonate units 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 Midwest. The unit represents deposition in a subtropical, shallow-water, carbonate platform environment. The rocks are principally micritic limestones, fossiliferous wackestones, and fossiliferous packstones. Some chert nodule horizons are present. 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.

Stratigraphy: upper Columbus Limestone (Eifelian Stage, lower Middle Devonian)

Locality: roadcut along access road on the northern margin of Marblecliff Quarry (Martin Marietta Aggregates), just east of the guardhouse, west of the Scioto River & east of Dublin Road, Hilliard, northwestern Franklin County, central Ohio, USA (40° 00’ 55.74” North latitude, 83° 05’ 58.78” West longitude)
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Source Chert nodule horizon in fossiliferous limestones (Columbus Limestone, Middle Devonian; Marblecliff Quarry, Hilliard, Ohio, USA)
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@N05/48384566297 (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.

12 October 2019

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current04:38, 12 October 2019Thumbnail for version as of 04:38, 12 October 20191,799 × 1,199 (2.73 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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