Allegheny Formation (PAPAa;6)

State	Pennsylvania
Name	Allegheny Formation
Geologic age	Pennsylvanian
Original map label	Pa
Comments	Digital map differences from 1980 printed map: name changed from group to formation.
Primary rock type	sandstone
Secondary rock type	shale
Other rock types	limestone; clay or mud; coal
Lithologic constituents	Major Sedimentary > Clastic > Sandstone Minor Sedimentary > Coalcommercially valuable Freeport, Kittanning, and Brookville-Clarion coals present; base is at bottom of Brookville-Clarion coal. Unconsolidated > Fine-detrital > Clayincludes valuable clay deposits Sedimentary > Carbonate > LimestoneVanport Limestone Sedimentary > Clastic > Mudstone > Shale
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	Allegheny - Armstrong - Beaver - Bedford - Blair - Butler - Cambria - Cameron - Centre - Clarion - Clearfield - Clinton - Elk - Fayette - Forest - Fulton - Huntingdon - Indiana - Jefferson - Lawrence - McKean - Mercer - Somerset - Venango - Westmoreland