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Mahantango Formation

Mahantango Formation (part of Millboro Shale) - thickly laminated marine shale, siltstone, very fine sandstone, and some limestone, with an occasional coral reef or biostrome. Contains the Clearville and Chaneysville Siltstone Members of Pennsylvania.
StateWest Virginia
NameMahantango Formation
Geologic ageDevonian
Original map labelDmt
CommentsThickness: Northeastern 20-1800 ft, Southeastern 0-500 ft
Primary rock typeshale
Secondary rock typesandstone
Other rock typessiltstone; limestone; coral
Lithologic constituents
Major
Sedimentary > Clastic > Sandstonevery fine sandstone
Sedimentary > Clastic > Mudstone > Shalethickly laminated marine shale
Minor
Sedimentary > Clastic > Siltstone
Incidental
Sedimentary > Carbonate > Limestone (Reef)and some limestone, with an occasional coral reef or biostrome.
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 - Mineral - Monroe - Morgan - Pendleton

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