File:Polished "Nellie Blue Flint" arrowhead (Upper Mercer Flint, Middle Pennsylvanian; Coshocton County, Ohio,, USA) 1.jpg
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English: Polished "Nellie Blue Flint" arrowhead from the Pennsylvanian of Ohio, USA. (~4.6 centimeters tall) (made by Warren Whitmer)
"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. Nellie Blue Flint is essentially restricted to the Nellie area of northwestern Coshocton County. It consists of attractive, frequently complexly-patterned, dark bluish to bluish-black chert. Fractures and cavities (vugs) are often present and have been filled or nearly filled with pale bluish-gray chalcedony and/or megaquartz (= visible hexagonal quartz crystals). Body fossils and trace fossils can be present. Nellie Blue is a local color variant of the Upper Mercer Flint, which is usually a black flint with whitish speckles (= often body fossils and fossil fragments). The Upper Mercer Flint is a somewhat persistent horizon of chertified marine fossiliferous limestone in east-central and eastern Ohio called the Upper Mercer Limestone. Stratigraphy: Upper Mercer Flint (= chertified Upper Mercer Limestone), upper Bedford Cyclothem, upper Pottsville Group, Atokan Series, lower Middle Pennsylvanian Locality: unrecorded site at or near the town of Nellie, northwestern Coshocton County, east-central Ohio, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/51429336370/ |
| 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@N05/51429336370. It was reviewed on 7 September 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 15:03, 7 September 2021 | | 1,136 × 2,484 (1.6 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51429336370/ with UploadWizard |
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