Template:Lithostratigraphy of the southeastern Delaware Neogene
| Group | Formation |
|---|---|
| Columbia Group | Omar Formation |
| Beaverdam Formation | |
| Chesapeake Group | Bethany Formation |
| Manokin Formation | |
| St. Mary's Formation | |
| Choptank Formation | |
| Calvert Formation | |
| Lithostratigraphic units of the Chesapeake and Columbia groups in southeastern Sussex County, Delaware.[1] | |
- ^ Groot, Johan J.; Ramsey, Kelvin W.; Wehmiller, John F. (Feb 1990). RI47 Ages of the Bethany, Beaverdam, and Omar Formations of Southern Delaware (PDF) (Report). Report of Investigations No. 47. Delaware Geological Survey. Retrieved 9 June 2018.