File:Fossiliferous Flint (Upper Mercer Flint, Middle Pennsylvanian; Nellie West Outcrop, Coshocton County, Ohio, USA) 1 (31803128551).jpg
"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 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 has a fossil solitary rugose coral exposed in transverse cross-section.
The light-colored rind at top is non-chertified Upper Mercer - in other words, limestone.
Classification: Animalia, Cnidaria, Anthozoa, Rugosa
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, USALicensing
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/31803128551. 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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