| Geologic Unit | Lithology | Age |
| Alluvium (general) | Gravel, sand, clay, silt | Quaternary |
| Freshwater backswamp and meander belt | Sand, clay, some silt and gravel | |
| Mangrove and salt water/backswamps | Medium-fine sand, clay and some silt | |
| Sombreiro-warri deltaic plain | Sand, clay and some silt | |
| Benin formation (coastal plain sand) | Coarse to medium sand with subordinate silt and clay lenses | Miocene |
| Agbada formation | Mixture of sand, clay and silt | Eocene |
| Akata formation | Clay | Paleocene |