| Formation age | Thickness (m) | Type of rocks | Main hydraulic characteristics | General consideration |
| Lower Cretaceous | 70 - 150 | Mainly coarse-grained sandstone with some clay lenses | One aquifer | One major interconnected sandstone and siltstone aquifer containing fresh water |
| Ordovician | 820 - 970 | Coarse, medium and fine-grained sandstone with some silt and conglomerate. | One inter-connected aquifer | |
| Cambrian | 380 - 400 | |||
| Granitic basement |
| Mainly granite | Aquifuge |
|