Middle and Upper Devonian, undivided

This unit is predominantly shale, and includes all Devonian beds above the Onesquethaw. Consists of units: Hampshire Formation, Chemung Group, Brallier Formation, Harrell Shale, Mahantango Formation, and Marcellus Formation.
State West Virginia
Name Middle and Upper Devonian, undivided
Geologic age Devonian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Comments Consists of units: Hampshire Formation, Chemung Group, Brallier Formation, Harrell Shale, Mahantango Formation, and Marcellus Formation. Combined thickness: Northeastern 5345-10900 ft, Western 3245 ft, Southeastern 1050-4100 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 Mercer