List of fossiliferous stratigraphic units in Maryland
# 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 |
