Nellie Blue Flint (Upper Mercer Flint, Middle Pennsylvanian; Nellie area, Coshocton County, Ohio, USA) 175

            Flint (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.  Some famous flint occurrences in eastern Ohio include the Vanport Flint, the Upper Mercer / Coshocton / Nellie Blue Flint, and the Zaleski Flint.

Nellie Blue Flint is essentially restricted to the Nellie area of 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 black 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: ~southeast of the town of Nellie, western Coshocton County, east-central Ohio, USA

Some rights reserved

Taken on: July 1, 2024

Tags:

Nellie

Blue

chert

Pottsville

Group

Upper

Mercer

Pennsylvanian

Coshocton

County

Ohio « less

Sets appears in: • Ohio Rocks, Minerals, Fossils • Chert / Flint more » • Pennsylvanian Rocks & Fossils • Pottsville Group (Lower and Middle Pennsylvanian; eastern Ohio, USA) • Upper Mercer Flint & Upper Mercer Limestone (Middle Pennsylvanian; eastern Ohio, USA) • Nellie Blue Flint (Upper Mercer Flint, Middle Pennsylvanian; Nellie, Coshocton County, Ohio, USA) « less

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