Hydraulic Character

Thickness (m)

Lithology

Formation

Age

Aquifer

0 - 20

Sands and gravel

Alluvium

Recent Quaternary

Aquifer

0 - 400

Basalt

Basalt

L. Tertiary

Aquifer

0 - 15

Weathered limestone

Um Qirma (B5)

L. Eocene

Aquiclude

160 - 430

Marl and Chalk

Wadi el Shallala (B5)

L. Eocene

Aquifer

170 - 300

Argillaceous silicified limestone

Umm Rijam (B4)

Mid-Eocene

Aquiclude

>100

Marly limestone

Muwaqqar (B3)

E. Eocene