Rockwell Formation (PAMDr;12)

State	Pennsylvania
Name	Rockwell Formation
Geologic age	Mississippian and Devonian
Original map label	MDr
Primary rock type	sandstone
Secondary rock type	shale
Other rock types	conglomerate
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale (Bed)dark-gray shale; includes some carbonaceous shale Sedimentary > Clastic > Sandstone (Bed)Buff, fine- to medium-grained, crossbedded, argillaceous sandstone Minor Sedimentary > Clastic > Conglomerate (Bed)sporadic conglomerate beds, and diamictite
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 [http://www.dcnr.state.pa.us/topogeo/map1/bedmap.aspx]
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 [http://www.dcnr.state.pa.us/topogeo/map1/bedmap.aspx]
Geographic coverage	Bedford - Blair - Cambria - Centre - Clearfield - Fulton - Huntingdon - Somerset