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Millboro Shale

Millboro Shale - dark grey to black shale facies of eastern West Virginia. Consists of units: Harrell Shale, Mahantango Formation and Marcellus Formation.
StateWest Virginia
NameMillboro Shale
Geologic ageDevonian
Original map labelDmb
CommentsConsists of units: Harrell Shale, Mahantango Formation and Marcellus Formation. Combined thickness: Northeastern 220-2380 ft, Western 475 ft, Southeastern 150-900 ft.
Primary rock typeshale
Secondary rock typeblack shale
Other rock types
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Clastic > Mudstone > Shale > Black-shale
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 - Monroe - Pendleton - Pocahontas

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