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Patapsco(?) Formation

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
Primary rock type clay or mud
Secondary rock type sand
Other rock types
Lithologic constituents
Major
Unconsolidated > Fine-detrital > ClayIntensely colored, variegated, ferruginous clay
Minor
Unconsolidated > Coarse-detrital > Sand (Bed)
Map references
Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map. Retrieved from internet 9-30-2004; <http://www.dcnr.state.pa.us/topogeo/map1/bedmap.aspx> DL Data: pageoexp.zip
Unit 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, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map. Retrieved from internet 9-30-2004; <http://www.dcnr.state.pa.us/topogeo/map1/bedmap.aspx> DL Data: pageoexp.zip
Counties Montgomery