Oriskany Sandstone and Helderberg Group, undivided

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.
State West Virginia
Name Oriskany Sandstone and Helderberg Group, undivided
Geologic age Devonian
Lithologic constituents
Major
Sedimentary > Carbonate > LimestoneHelderburg Group: mostly cherty limestone
Sedimentary > Clastic > Sandstone (Calcareous)Oriskany Sandstone: 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: some sandstone
Minor
Sedimentary > Clastic > Mudstone > ShaleHelderburg Group: some sandstone and shale
Comments Printed map has no indiviual description for this unit and no name, but has individual symbol and color. Only uses brackets to combine Do and Dhl. Dohl is used in digital map, so combined Do and Dhl together and called this the "Oriskany Sandstone and Helderberg Group, undivided". Combined thickness: Northeastern 352 ft, Western 285 ft, Southeastern 175-225 ft.
References

Cardwell, D.H., Erwin, R.B., and Woodward, H.P., 1968 (slightly revised 1986), Geologic Map of West Virginia: West Virginia Geological and Economic Survey, Map 1, East Sheet, scale 1:250,000.

NGMDB product
Counties Berkeley - Greenbrier - Hampshire - Hardy - Mercer - Monroe - Morgan - Pendleton - Pocahontas