Lockatong Formation (PATRl;3)

State	Pennsylvania
Name	Lockatong Formation
Geologic age	Triassic
Original map label	Trl
Primary rock type	argillite
Secondary rock type	shale
Other rock types	limestone; black shale
Lithologic constituents	Major Metamorphic > Metasedimentary > Metaclastic > Argillite (Bed)Dark-gray to black, thick-bedded argillite containing a few zones of thin-bedded black shale, locally has thin layers of impure limestone and calcareous shale. Minor Sedimentary > Carbonate > Limestone (Bed)Dark-gray to black, thick-bedded argillite containing a few zones of thin-bedded black shale, locally has thin layers of impure limestone and calcareous shale. Sedimentary > Clastic > Mudstone > Shale (Bed)Dark-gray to black, thick-bedded argillite containing a few zones of thin-bedded black shale, locally has thin layers of impure limestone and calcareous shale. Incidental Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)Dark-gray to black, thick-bedded argillite
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	Berks - Bucks - Chester - Montgomery