Formation age

Type of rocks

Thickness (m)

Main hydraulic characteristics

General consideration

Surficial recent deposits

Recent gravels, sand, and silt

Up to 30 m

Local aquifer when conditions allow

Irrelevant as a source of water

Upper Cretaceous-Tertiary

Bituminous Marl

200 - 300 m

Aquitard

Aquitards, confining layer

Campanian Maastrichtian

Silicified limestone overlain by beds of phosphatic chert

Around 70 m

Excellent aquifer

Good to excellent Aquifer

Turonian-Santonian

Massive sandy limestone

55 m

Good aquifer

Cenomanian

Alternating beds of limestone, dolomite, marly limestone, dolomitic limestone, sandstone, marl and some gypsum layers

Around 300 m

Poorly developed aquifer. In many areas’ springs issued from the limestone and dolomite beds

In general, poorly developed aquifers with some good yield aquifer layers. On a regional scale it doesn’t form an aquiclude

Lower Cretaceous

Coarse, medium and fine-grained sandstone

160 - 200 m

Good aquifer

Good to excellent aquifer, S of Mujib directly overlie Silurian deposits