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Martinsburg Formation

Martinsburg Formation - predominantly gray to dark shale, yellowish in the upper portion. Contains scattered thin limestone and sandstone interbeds, particularly in the lower portion. The upper portion constitutes the Reedsville Shale.
StateWest Virginia
NameMartinsburg Formation
Geologic ageOrdovician
Original map labelOm
CommentsThickness: Northeastern 300-1800 ft, Western 995 ft, Southeastern 1200 ft. Reedsville Shale in Northeastern portion (Western Pendleton County) is 1800 ft thick.
Primary rock typeshale
Secondary rock typelimestone
Other rock typessandstone
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)predominantly gray to dark shale, yellowish in the upper portion; The upper portion constitutes the Reedsville Shale.
Minor
Sedimentary > Carbonate > Limestone (Bed)Contains scattered thin limestone and sandstone interbeds
Sedimentary > Clastic > Sandstone (Bed)Contains scattered thin limestone and sandstone interbeds
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 - Grant - Hampshire - Hardy - Jefferson - Mercer - Monroe - Pendleton

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