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Glenshaw Formation

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Cyclic sequences of shale, sandstone, red beds, and thin limestone and coal; includes four marine limestone or shale horizons; red beds are involved in landslides; base is at top of Upper Freeport coal.
State Pennsylvania
Name Glenshaw Formation
Geologic age Pennsylvanian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shaleincludes four marine limestone or shale horizons
Minor
Sedimentary > Carbonate > Limestoneincludes four marine limestone or shale horizons
Sedimentary > Clasticred beds; red beds are involved in landslides
Sedimentary > Coal
Sedimentary > Clastic > Sandstone
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 Allegheny - Armstrong - Beaver - Bedford - Blair - Butler - Cambria - Centre - Clarion - Clearfield - Elk - Fayette - Greene - Indiana - Jefferson - Lawrence - Somerset - Washington - Westmoreland