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Beekmantown or Lower Ordovician Group

Beekmantown or Lower Ordovician Group - mainly thick-bedded limestone and dolomite. Various units produce much chert on outcrop. Consists of units: Pinesburg Station Dolomite, Rockdale Run Formation, and Stonehenge Limestone.
StateWest Virginia
NameBeekmantown or Lower Ordovician Group
Geologic ageOrdovician
Original map labelOb
CommentsConsists of units: Pinesburg Station Dolomite, Rockdale Run Formation, and Stonehenge Limestone. Combined thickness: 3800-4200 ft, Western 980 ft, Southeastern 1300 ft.
Primary rock typelimestone
Secondary rock typedolostone (dolomite)
Other rock typeschert
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Minor
Sedimentary > Chemical > Chert (Bed)Various units produce much chert on outcrop
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 coverageBerkeley - Mercer - Monroe

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