Marcellus Formation

Black shale; sparse marine fauna and siderite concretions. Contains local limestone (""Purcell"") member. Tioga bentonite included at base in eastern Pennsylvania.
State Pennsylvania
Name Marcellus Formation
Geologic age Devonian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)black shale; sparse marine fauna and siderite concretions.
Minor
Sedimentary > Carbonate > Limestone (Bed)contains local limestone (""Purcell"") member.
Sedimentary > Clastic > Mudstone > Claystone > Bentonite (Bed)Tioga bentonite included at base in eastern Pennsylvania.
References

Berg, T.M., Edmunds, W.E., Geyer, A.R., and others, compilers, 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey, 4th ser., Map 1, 2nd ed., 3 sheets, scale 1:250,000.

Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, Miles, C.E., and Whitfield, T.G., compilers, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map, scale 1:250,000.

NGMDB product
Counties Carbon - Monroe - Pike - Schuylkill