Late Pliocene to Early Pleistocene; Extinct.
Southern Florida to North Carolina.
- Early Pleistocene
- Caloosahatchee Formation (S. FL)
- Nashua Formation (N. FL)
- Waccamaw Formation (SC, NC)
- Late Pliocene
- Duplin Formation (SC, NC)
- Jackson Bluff Formation (N. FL)
- Raysor Formation (SC)
- Tamiami Formation (Pinecrest Beds) (S. FL)