Casselman Formation

Cyclic sequences of shale, siltstone, sandstone, red beds, thin, impure limestone, and thin, nonpersistent coal; red beds are associated with landslides; base is at top of Ames limestone.
State Pennsylvania
Name Casselman Formation
Geologic age Pennsylvanian
Lithologic constituents
Sedimentary > Clasticred beds, red beds are associated with landslides
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Sedimentary > Carbonate > Limestonethin, impure limestone
Sedimentary > Clastic > Siltstone
Sedimentary > Coaland thin, nonpersistent coal

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 - Butler - Cambria - Clearfield - Fayette - Greene - Indiana - Jefferson - Somerset - Washington - Westmoreland