# List of fossiliferous stratigraphic units in Pennsylvania

This article contains a list of fossil-bearing stratigraphic units in the state of Pennsylvania, U.S.

## Sites

| Group or Formation | Period |
| 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 |
| Pleasant Hill Limestone | Cambrian |
| Pocono Formation | Carboniferous, Devonian |
| Pottsville Formation | Carboniferous |
| Reedsville Group/ Martinsburg Formation | Ordovician |
| Rockdale Run 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 |