Hamilton Group (PADh;0)

State	Pennsylvania
Name	Hamilton Group
Geologic age	Devonian
Original map label	Dh
Primary rock type	black shale
Secondary rock type	shale
Other rock types	siltstone; limestone; sandstone; bentonite
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed) Minor Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Clastic > Siltstone (Bed) Sedimentary > Clastic > Mudstone > Shale (Bed) Incidental Sedimentary > Clastic > Mudstone > Claystone > Bentonite (Bed) Sedimentary > Carbonate > Limestone (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 [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 - Carbon - Centre - Clinton - Columbia - Dauphin - Franklin - Fulton - Huntingdon - Juniata - Lebanon - Luzerne - Lycoming - Mifflin - Montour - Northumberland - Perry - Schuylkill - Snyder - Union