File:Fossiliferous chert (Upper Mercer Flint, Middle Pennsylvanian; Nellie West Outcrop, Coshocton County, Ohio, USA) 5 (31110222613).jpg

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Summary

Description

Fossiliferous chert from the Pennsylvanian of Ohio, USA.

"Flint" is the official gemstone of Ohio. Flint is actually chert (the two terms are synonymous, despite what anyone else might say), a cryptocrystalline, quartzose sedimentary rock. High-quality, colorful, multicolored, and multipatterned flint is moderately common at some Ohio localities. A couple famous flint occurrences in east-central Ohio include the Vanport Flint at Flint Ridge and Nellie Blue Flint in Coshocton County.

The rock shown above is weathered chert from the Upper Mercer Flint, a somewhat persistent horizon of chertified marine fossiliferous limestone in east-central and eastern Ohio called the Upper Mercer Limestone. The Upper Mercer is usually a black flint with whitish speckles (= often body fossils and fossil fragments). This sample is quite fossiliferous. The prominent, gray-colored fossil is a brachiopod shell. Brachiopods are sessile, benthic, filter-feeding lophophorates with two shells. They first appear as fossils in the Cambrian and were abundant on many shallow seafloors during the Paleozoic. They are scarce in modern oceans.

Stratigraphy: Upper Mercer Flint (= chertified Upper Mercer Limestone), upper Bedford Cyclothem, upper Pottsville Group, Atokan Series, lower Middle Pennsylvanian

Locality: Nellie West Outcrop, western Jefferson Township, western Coshocton County, east-central Ohio, USA
Date
Source Fossiliferous chert (Upper Mercer Flint, Middle Pennsylvanian; Nellie West Outcrop, Coshocton County, Ohio, USA) 5
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@N05/31110222613. It was reviewed on 24 June 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

24 June 2017

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27 December 2016

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current17:28, 24 June 2017Thumbnail for version as of 17:28, 24 June 20172,202 × 2,439 (4.35 MB)Ser Amantio di NicolaoTransferred from Flickr via Flickr2Commons

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