This article contains a list of fossil-bearing stratigraphic units in the state of Delaware, U.S.
| Group or Formation | Period | Notes |
|---|---|---|
| Chesapeake Group/Calvert Formation | Neogene | |
| Crosswicks Clay | Cretaceous | |
| Englishtown Formation | Cretaceous | |
| Marshalltown Formation | Cretaceous | |
| Matawan Formation | Cretaceous | |
| Merchantville Formation | Cretaceous | |
| Mount Laurel Formation | Cretaceous |
