Trimmers Rock Formation (PADtr;16)

State	Pennsylvania
Name	Trimmers Rock Formation
Geologic age	Devonian
Original map label	Dtr
Primary rock type	siltstone
Secondary rock type	shale
Other rock types	sandstone; black shale
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale (Bed)Olive-gray siltstone and shale, characterized by graded bedding; marine fossils Sedimentary > Clastic > Siltstone (Bed)Olive-gray siltstone and shale, characterized by graded bedding; marine fossils Minor Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)black shale of Harrell Formation at base in Susquehanna Valley. Sedimentary > Clastic > Sandstone (Bed)some very fine grained sandstone in northeast
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	Carbon - Columbia - Dauphin - Juniata - Lebanon - Luzerne - Lycoming - Mifflin - Monroe - Montour - Northumberland - Perry - Pike - Schuylkill - Snyder - Union