Coburn Formation through Nealmont Formation, undivided

In descending order: Coburn Formation--medium-gray to very dark gray, very fossiliferous limestone and shaly limestone; Salona Formation--very dark gray to black, nonfossiliferous shaly limestone and calcareous shale containing metabentonite beds; Nealmont Formation--medium-gray fossiliferous limestone (calcarenite--Rodman Member) overlying thin-bedded shaly limestone (calcilutite--Center Hall Member).
State Pennsylvania
Name Coburn Formation through Nealmont Formation, undivided
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed, Calcareous)Coburn Formation--medium-gray to very dark gray shaly limestone; Salona Formation--very dark gray to black, nonfossiliferous shaly limestone and calcareous shale containing metabentonite beds; Nealmont Formation--thin-bedded shaly limestone (calcilutite--Center Hall Member).
Sedimentary > Carbonate > Limestone (Bed)Coburn Formation--medium-gray to very dark gray, very fossiliferous limestone and shaly limestone; Salona Formation--very dark gray to black, nonfossiliferous shaly limestone; Nealmont Formation--medium-gray fossiliferous limestone (calcarenite--Rodman Member) overlying thin-bedded shaly limestone (calcilutite--Center Hall Member).
Minor
Sedimentary > Clastic > Mudstone > Claystone > Bentonite (Bed)Salona Formation--containing metabentonite beds
Sedimentary > Clastic > Sandstone > Arenite > Calcarenite (Bed)Nealmont Formation--medium-gray fossiliferous limestone (calcarenite--Rodman Member).
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 Centre - Clinton - Huntingdon - Lycoming - Mifflin