Shenango Formation through Cuyahoga Group, undivided

Includes the Shenango Formation (Ms) and Cuyahoga Group (Mc), which are described separately below. Shenango: Light-gray sandstone and some beds of medium-gray shale and siltstone; upper third of formation is more shaly; contains a few marine fossils. Cuyahoga: Medium-gray siltstone and dark-gray shale containing interbedded light-gray, flaggy sandstone. Includes, in descending order: Meadville Shale, Sharpsville Sandstone, and Orangeville Shale; marine fossils common.
State Pennsylvania
Name Shenango Formation through Cuyahoga Group, undivided
Geologic age Mississippian
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)Shenango: Light-gray sandstone; Cuyahoga: interbedded light-gray, flaggy sandstone.; Sharpsville Sandstone, marine fossils common.
Minor
Sedimentary > Clastic > Mudstone > Shale (Bed)Shenango: some beds of medium-gray shale, upper third of formation is more shaly; contains a few marine fossils. Cuyahoga: dark-gray shale containing interbedded light-gray, flaggy sandstone; Includes, in descending order: Meadville Shale and Orangeville Shale; marine fossils common.
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 Clarion - Forest - Venango - Warren