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Helderberg Group

Helderberg 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.
StateWest Virginia
NameHelderberg Group
Geologic ageDevonian
Original map labelDhl
CommentsIncludes: Rocky Gap Sandstone (USGS) used on Southeastern columnar section. Thickness: Northeastern 350-445 ft, Western 210 ft, Southeastern 0-50 ft, Southeastern - Rocky Gap Sandstone 175 ft.
Primary rock typelimestone
Secondary rock typesandstone
Other rock typesshale
Lithologic constituents
Major
Sedimentary > Carbonate > Limestonemostly cherty limestone
Minor
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Map references
Digital version of 1968 printed map available from http://wvgis.wvu.edu/data/data.php with the specific data available from http://wvgis.wvu.edu/data/dataset.php?action=search&ID=43
Unit 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.
Geographic coverageGrant - Greenbrier - Hampshire - Hardy - Mineral - Pendleton - Pocahontas

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=WVDhl;0
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