List of fossiliferous stratigraphic units in Arkansas
# 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 |
