Millboro Shale

Dark grey to black shale facies of eastern West Virginia. Consists of units: Harrell Shale, Mahantango Formation and Marcellus Formation.
State West Virginia
Name Millboro Shale
Geologic age Devonian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Clastic > Mudstone > Shale > Black-shale
Comments Consists of units: Harrell Shale, Mahantango Formation and Marcellus Formation. Combined thickness: Northeastern 220-2380 ft, Western 475 ft, Southeastern 150-900 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 Grant - Greenbrier - Monroe - Pendleton - Pocahontas