Age | Formation | Type of rocks | Thickness (m) |
Eocene | Chalk Marl B4/5 | Chalk marl and chert | Up to 150 |
Cretaceous-Tertiary | Bituminous Marl B3 | Bituminous Marl | Only in small outcrops |
Campanian Maastrichtian | Um Ghudran Silicified Limestone B1/2 | Silicified limestone overlain by chert beds | Around 70 m |
Turonian-Santonian | Massive Limestone A7 | Massive sandy limestone | 55 m |
Cenomanian | Na’ur A1/2, Fuheis A3 Hummar A4, Shueib A5/6 | Alternating beds of limestone, dolomite, marly limestone, dolomitic limestone, sandstone, marl and some gypsum layers and evaporate residues | Around 300 m |
Deep sandstone aquifer system | Lower Cretaceous-Precambrian | Coarse, medium and fine-grained sandstone | 1450 - 1600 m |