Nellie Blue Flint (Upper Mercer Flint, Middle Pennsylvanian; Nellie area, Coshocton County, Ohio, USA) 147 : 無料・フリー素材/写真
Nellie Blue Flint (Upper Mercer Flint, Middle Pennsylvanian; Nellie area, Coshocton County, Ohio, USA) 147 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | 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 PennsylvanianLocality: ~southeast of the town of Nellie, western Coshocton County, east-central Ohio, USA |
| 撮影日 | 2024-05-27 12:29:34 |
| 撮影者 | James St. John |
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