title: List of fossiliferous stratigraphic units in Pennsylvania
text: # 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 |
  