title: List of fossiliferous stratigraphic units in Maryland
text: # List of fossiliferous stratigraphic units in Maryland
  
  This article contains a list of fossil-bearing stratigraphic units in the state of Maryland, U.S.
  
  ## Sites
  
  | Group or Formation | Period |
  | - | - |
  | Allegheny Formation | Carboniferous |
  | Antietam Formation | Cambrian |
  | Aquia Formation | Paleogene |
  | Brightseat Formation | Paleogene |
  | Calvert Formation | Neogene |
  | Chatham Group/Gettysburg Formation | Triassic |
  | Chemung Formation | Devonian |
  | Chesapeake Group/Calvert Formation | Neogene |
  | Chesapeake/Choptank Formation | Neogene |
  | Chesapeake/St. Marys Formation | Neogene |
  | Clinton Group/Keefer Sandstone | Silurian |
  | Clinton/Rochester Shale | Silurian |
  | Clinton/Rose Hill Formation | Silurian |
  | Conemaugh Group | Carboniferous |
  | Dunkard Group/Greene Formation | Permian |
  | Foreknobs Formation | Devonian |
  | Greenland Gap Group/Foreknobs Formation | Devonian |
  | Jennings Formation | Devonian |
  | Aquia Formation | Paleogene |
  | Magothy Formation | Cretaceous |
  | Marcellus Formation | Devonian |
  | Matawan Formation | Cretaceous |
  | McKenzie Formation | Silurian |
  | Merchantville Formation | Cretaceous |
  | Mifflintown Formation | Silurian |
  | Monmouth Formation | Cretaceous |
  | Nanjemoy Formation | Paleogene |
  | Onondaga Formation | Devonian |
  | Pamlico Formation | Neogene |
  | Pamunkey Group/Aquia Formation | Paleogene |
  | Pamunkey/Brightseat Formation | Paleogene |
  | Pamunkey/Nanjemoy Formation | Paleogene |
  | Arundel Clay | Cretaceous |
  | Patapsco Formation | Cretaceous |
  | Patuxent Formation | Cretaceous |
  | Rockdale Run Formation | Ordovician |
  | Romney Formation | Devonian |
  | Severn Formation | Cretaceous |
  | St. Marys Formation | Neogene |
  | Stonehenge Limestone | Ordovician |
  | Talbot Formation | Neogene |
  | Tonoloway Limestone | Silurian |
  | Williamsport Sandstone | Silurian |
  | Wills Creek Limestone | Silurian |
  