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.
State West Virginia
Name Mahantango Formation
Geologic age Devonian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shalethickly laminated marine shale
Sedimentary > Clastic > Sandstonevery fine sandstone
Minor
Sedimentary > Clastic > Siltstone
Incidental
Sedimentary > Carbonate > Limestone (Reef)and some limestone, with an occasional coral reef or biostrome.
Comments Thickness: Northeastern 20-1800 ft, Southeastern 0-500 ft
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.

NGMDB product
Counties Berkeley - Grant - Hampshire - Hardy - Mineral - Monroe - Morgan - Pendleton