Formation age | Type of rocks | Thickness (m) | Main hydraulic characteristics | General consideration |
Basalts | Basalts, scoria, tuff | Up to 700 m | Excellent aquifer | Shallow aquifer connected with all underlying aquifers |
Paleocene Eocene | Chalk marls | 0 - 40 m | Medium aquifer | Only encountered in some places |
Campanian Maastrichtian | Silicified limestone | Around 70 m | Excellent aquifer | Main water aquifer |
Turonian | Marl lenses | 0 - 20 m | Lenses of an aquiclude | On very small scale of 100 m aquiclude |
Turonian Santonian | Massive sandy limestone | 60 m | Excellent aquifer | Excellent karst aquifer |
Cenomanian | Alternating beds of limestone, dolomite, marly limestone, sandstone, marl and some gypsum layers | Around 300 m | Poorly developed aquifer. | In general, poorly developed aquifer with some good yields layers |
Lower Cretaceous | Coarse, medium and coarse-grained sandstone | 210 m | Good aquifer | Good to excellent |