Patapsco(?) Formation

Intensely colored, variegated, ferruginous clay and, in places, beds of sand; occurs in isolated patches.
State Pennsylvania
Name Patapsco(?) Formation
Geologic age Cretaceous
Lithologic constituents
Unconsolidated > Fine-detrital > ClayIntensely colored, variegated, ferruginous clay
Unconsolidated > Coarse-detrital > Sand (Bed)

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 Montgomery