Conemaugh Group

Includes in descending order, the Casselman Formation (PAcc) and the Glenshaw Formation (PAcg), which are described separately below. Casselman: 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. Glenshaw: 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 Conemaugh Group
Geologic age Pennsylvanian
Lithologic constituents
Sedimentary > Clastic > Mudstone > ShaleCasselman & Glenshaw Formations
Sedimentary > ClasticCasselman and Glenshaw Formations, red beds; red beds are associated with landslides
Sedimentary > Clastic > SandstoneCasselman and Glenshaw Formations
Sedimentary > Clastic > SiltstoneCasselman Formation
Sedimentary > Carbonate > LimestoneCasselman: thin, impure limestone; Glenshaw: thin limestone, includes four marine limestone or shale horizons
Sedimentary > CoalCasselman: thin, nonpersistent coal; Glenshaw: 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 Bedford - Huntingdon