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Casselman Formation

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
Primary rock type shale
Secondary rock type siltstone
Other rock types sandstone; clastic; limestone; coal
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clasticred beds, red beds are associated with landslides
Minor
Sedimentary > Clastic > Siltstone
Sedimentary > Clastic > Sandstone
Sedimentary > Carbonate > Limestonethin, impure limestone
Incidental
Sedimentary > Coaland thin, nonpersistent coal
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 Allegheny - Armstrong - Beaver - Butler - Cambria - Clearfield - Fayette - Indiana - Jefferson - Somerset - Washington - Westmoreland