| Test area | Lithology | Depth (m) |
| Facobly | Clay sands Clay Sand | 0 - 1 1 - 21 21 - 27.8 |
| Flansobly | Sand Clay Clay sands | 0 - 0.9 0.9 - 4 4 - 11.12 |
| Siambly | Sandy loam Clay Sandy clay | 0 - 1.5 1.5 - 27 27 - 30 |
| Mangouen | Clay sands Clay | 0 - 1 1 - 10 |
| Gbonné | Loamy-clay sands | 0 - 1.6 |