| GEOLOGIC UNIT | LITHOLOGY | AGE |
| Alluvium (General) | Gravel, sand, clay, silt | Quaternary |
| Freshwater Back Swamp, Meander Belt | Sand, clay, some silt, gravel | |
| Mangrove and Saltwater/Back Swamps | Medium - fine sands | |
| Active/Abandoned Beach Ridges | Sand, clay, and some silt | |
| Sombreiro-Warri Deltaic Ridges | Sand | |
| Benin Formation (Coastal Plain Sands) | Coarse to medium sand with subordinate silt and clay lenses | Eocene |
| Agbada Formation | Mixture of sand, clay and silt | Eocene |
| Akata Formation | Clay | Eocene |