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Rock Formations

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Oriskany Sandstone and Helderberg Group, undivided (WVDohl;0)

Geologic Formation in WV, VA, MD

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Lithology

Geologic Age

Devonian (422.4 Ma – 359.3 Ma ago)

Geologic Unit Label

Dohl

Oriskany Sandstone: sometimes designated Ridgeley in eastern West Virginia. White to brown coarse- to fine-grained, partly calcareous sandstone, locally pebbly or conglomeratic, and ridge-forming. May be white, nearly pure silica, and a source of glass sand, as at Berkeley Springs, Morgan County. Helderburg Group: mostly cherty limestone, with some sandstone and shale. Contains several named stratigraphic units, including the Keyser Formation, which is partly Silurian and includes the Clifton Forge Sandstone and Big Mountain Shale Members.

— USGS

Paracyclas GENUS

Taxonomy

Geographic Places

Geological Feature

Geologic Formation

Classified As

Geologic Formation

Oriskany Sandstone and Helderberg Group, undivided (WVDohl;0)

Oriskany Sandstone and Helderberg Group, undivided (WVDohl;0)

Oriskany Sandstone and Helderberg Group, undivided (WVDohl;0)