| Group or Formation |
Period |
Notes |
| Allegheny Formation | Carboniferous | |
| Ames Formation | Carboniferous | |
| Anthracite Formation | Carboniferous | |
| Antietam Formation | Cambrian | |
| Bellefonte Formation | Ordovician | |
| Bloomsburg Formation | Silurian | |
| Canadaway Group/Canaseraga Formation | Devonian | |
| Canadaway Group/Cuba Formation | Devonian | |
| Canadaway Group/Java Formation | Devonian | |
| Canadaway Group/Machias Formation | Devonian | |
| Canadaway Group/Rushford Formation | Devonian | |
| Catskill Formation | Devonian | |
| Chatham Group/Hammer Creek Formation | Triassic | |
| Chemung Formation | Devonian | |
| Cherry Ridge Shale | Devonian | |
| Conemaugh Group | Carboniferous | |
| Conemaugh Group/Conemaugh Formation | Carboniferous | |
| Conemaugh Group/Glenshaw Formation | Carboniferous | |
| Conewango Group | Devonian | |
| Conewango Group/Pocono Formation | Devonian | |
| Conewango Group/Venango Formation | Devonian | |
| Conneaut Group/Cuba silt shale (Chadakoin) | Devonian | |
| Connemaugh Group | Carboniferous | |
| Connemaugh Group/Duquesne Coal | Carboniferous | |
| Cussewago Formation | Devonian | |
| Dunkard Group/Greene Formation | Permian | |
| Dunkard Group/Waynesburg Formation | Permian | |
| Gatesburg Formation | Cambrian | |
| Genesee Group/Ithaca Formation | Devonian | |
| Gettysburg Formation | Triassic | |
| Glenshaw Formation | Carboniferous | |
| Hamilton Group/Mahantango Formation | Devonian | |
| Hamilton Group/Marcellus Shale | Devonian | |
| Harrell Formation | Devonian | |
| Helderberg Formation | Devonian | |
| Jennings Formation | Devonian | |
| Keyser Limestone | Silurian | |
| Kinzers Formation | Cambrian | |
| Llewellyn Formation | Carboniferous | |
| Lock Haven Formation | Devonian | |
| Lockatong Formation | Triassic | |
| Pocono Formation | Devonian | |
| Mahantango Formation | Devonian | |
| Manlius Limestone | Devonian | |
| Martinsburg Formation | Ordovician | |
| Mauch Chunk Formation | Carboniferous | |
| Mercer Formation | Carboniferous | |
| Mifflintown Formation | Silurian | |
| Monongahela Group/Pittsburgh Formation | Carboniferous | |
| New Oxford Formation | Triassic | |
| Newark Group/Gettysburg Formation | Triassic | |
| Newark Group/Lockatong Formation | Triassic | |
| Newark Group/New Oxford Formation | Triassic | |
| Nittany Dolomite | Ordovician | |
| Old Point Formation | Devonian | |
| Onondaga Formation | Devonian | |
| Oswayo Sandstone | Devonian | |
| Passaic Formation | Triassic | |
| Pleasent Hill Limestone | Cambrian | |
| Pocono Formation | Carboniferous, Devonian | |
| Pottsville Formation | Carboniferous | |
| Reedsville Group/ Martinsburg Formation | Ordovician | |
| Rose Hill Formation | Silurian | |
| Shawangunk Formation | Silurian | |
| Sonyea Group/Delaware River Formation | Devonian | |
| Stockton Formation | Triassic | |
| Stonehenge Formation | Ordovician | |
| Susquehanna Group/Chemung Formation | Devonian | |
| Titusville Till | | |
| Tomstown Dolomite | Cambrian | |
| Venango Formation | Devonian | |
| Vintage Dolomite | Cambrian | |
| Warrior Formation | Cambrian | |
| Washington Formation | Permian | |
|
