title: List of fossiliferous stratigraphic units in Arkansas
text: # List of fossiliferous stratigraphic units in Arkansas
  
  This article contains a list of fossil-bearing stratigraphic units in the state of Arkansas, U.S.
  
  ## Sites
  
  | Group or Formation | Period |
  | - | - |
  | Annona Chalk | Cretaceous |
  | Arkadelphia Marl | Cretaceous |
  | Austin Chalk | Cretaceous |
  | Batesville Sandstone | Carboniferous |
  | Bloyd Shale | Carboniferous |
  | Boone Formation | Carboniferous |
  | Brownstown Marl | Cretaceous |
  | Cane Hill Member of Hale Formation | Carboniferous |
  | Claiborne Formation | Paleogene |
  | Collier Shale | Cambrian |
  | Comanche Formation | Cretaceous |
  | De Queen Formation | Cretaceous |
  | Dierks Limestone | Cretaceous |
  | Everton Formation | Ordovician |
  | Fayetteville Shale | Carboniferous |
  | Hale Formation | Carboniferous |
  | Hindsville Member of Batesville Formation | Carboniferous |
  | Imo Formation | Carboniferous |
  | Jackson Group/White Bluff Formation | Paleogene |
  | Kimmswick Limestone | Ordovician |
  | Marlbrook Marl | Cretaceous |
  | Midway Group | Paleogene |
  | Moorefield Formation | Carboniferous |
  | Morrow Group/Bloyd Formation | Carboniferous |
  | Nacatoch Formation | Cretaceous |
  | Nacatoch Sand | Cretaceous |
  | Navarro Group/Saratoga Chalk | Cretaceous |
  | Ozan Formation | Cretaceous |
  | Pentremital Limestone Group/Bloyd Formation | Carboniferous |
  | Pitkin Formation | Carboniferous |
  | Powell Formation | Ordovician |
  | Saratoga Chalk | Cretaceous |
  | Smackover Formation | Jurassic |
  | Smithville Formation | Ordovician |
  | St. Clair Limestone | Silurian |
  | St. Joe Formation | Carboniferous |
  | Taylor Group/Annona Chalk | Cretaceous |
  | Taylor Group/Ozan Formation | Cretaceous |
  | Theodosia Formation | Ordovician |
  | Trinity Group/Holly Creek Formation | Cretaceous |
  | Winslow Formation | Carboniferous |
  | Witts Springs Formation | Carboniferous |
  