List of mapped rock formations in Pennsylvania
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The following is a list of the mapped bedrock units in Pennsylvania. The rocks are listed in stratigraphic order.[1]
System | Group name | Formation name | Member name | Map symbol[2] |
---|---|---|---|---|
Triassic | Newark Group | Passaic Formation | Trp | |
Triassic | Newark Group | Lockatong Formation | Trl | |
Triassic | Newark Group | Stockton Formation | Trs | |
Permian | Dunkard Group | Greene Formation | Pg | |
Permian | Dunkard Group | Washington Formation | Pw | |
Pennsylvanian | Conemaugh Group | Cassleman Formation | φcc | |
Pennsylvanian | Conemaugh Group | Glenshaw Formation | φcg | |
Pennsylvanian | Allegheny Formation | φa | ||
Pennsylvanian | Llewellyn Formation | φl | ||
Pennsylvanian | Pottsville Formation | φp | ||
Mississippian | Mauch Chunk Formation | Mmc | ||
Mississippian | Pocono Formation (Burgoon Formation) |
Mp (Mb) | ||
Mississippian/Devonian | Spechty Kopf Formation | |||
Mississippian/Devonian | Rockwell Formation | |||
Mississippian/Devonian | Huntley Mountain Formation | |||
Devonian | Catskill Formation | Dck | ||
Devonian | Brallier Formation | Db | ||
Devonian | Harrell Formation | Dh | ||
Devonian | Hamilton Group | Mahantango Formation | Dmh | |
Devonian | Hamilton Group | Marcellus Formation | Dm | |
Devonian | Onondaga Formation | Do | ||
Devonian | Old Port Formation | Dop | ||
Devonian | Old Port Formation | Ridgeley Member | Dr | |
Devonian/Silurian | Keyser Formation | DSk | ||
Silurian | Tonoloway Formation | Sto | ||
Silurian | Wills Creek Formation | Swc | ||
Silurian | Bloomsburg Formation | Sb | ||
Silurian | Mifflintown Formation | Sm | ||
Silurian | Clinton Group | Keefer Formation | Sk | |
Silurian | Clinton Group | Rose Hill Formation | Srh | |
Silurian | Tuscarora Formation | St | ||
Silurian | Shawangunk Formation | Ss | ||
Ordovician | Juniata Formation | Oj | ||
Ordovician | Bald Eagle Formation | Obe | ||
Ordovician | Reedsville Formation | Or | ||
Ordovician | Martinsburg Formation | Om | ||
Ordovician | Trenton Group | Coburn Formation | ||
Ordovician | Trenton Group | Salona Formation | ||
Ordovician | Trenton Group | Nealmont Formation | ||
Ordovician | Benner Formation | Om | ||
Ordovician | Bellefonte Formation | Obf | ||
Ordovician | Axeman Formation | Oa | ||
Ordovician | Nittany Formation | On | ||
Ordovician | Stonehenge/Larke Formation | Osl | ||
Cambrian | Warrior Formation | Cw | ||
Cambrian | Chickies Formation | Cch | ||
Cambrian/Ediacaran[3] | Wissahickon Formation | CZw | ||
Mesoproterozoic Era | Baltimore Gneiss | Ybg | ||
Note: Some of the Formations are laterally equivalent in age. They are listed in order from West to East in this case.
References
- ↑ Berg, T.M., et al., (1983). Stratagraphic Correlation Chart of Pennsylvania: G75, Pennsylvania Geologic Survey, Harrisburg, Pennsylvania.
- ↑ Berg, T.M., Edmunds, W.E., Geyer, A.R. and others, compilers, (1980). Geologic Map of Pennsylvania: Pennsylvania Geologic Survey, Map 1, scale 1:250,000.
- ↑ Blackmer, G.C., (2005). Preliminary Bedrock Geologic Map of a Portion of the Wilmington 30- by 60-Minute Quadrangle, Southeastern Pennsylvania. Pennsylvania Geologic Survey, Open-File Report OFBM-05-01.0.
See also
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