Late Pliocene to Early Pleistocene; Extinct.
South Florida to Virginia.
- Early Pleistocene
- Caloosahatchee Formation (N. FL)
- James City Formation (NC)
- Late Pliocene
- Duplin Formation (GA, NC)
- Duplin Formation (SC)
- Jackson Bluff Formation (N. FL)
- Tamiami Formation (Pinecrest Beds) (S. FL)
- Yorktown Formation (Sunken Meadow Member) (VA)