Outcrops exist in the A'nabta anticline and on the western limb of Nablus - Beit Qad syncline. In the A'nabta area, the chalk is thin and consists of marly base and passes upwards through bedded and crystalline limestone that have few marl partings. The very low permeability of chalk makes a good aquiclude. These rocks range in age from the Eocene to Pliocene age. They are exposed in the A'nabta area and in the Nablus-Beit Qad syncline.
Lithology is marked mainly by chalk and limestone with some conglomerate.
The chalk and the limestone are represented by several covers including some chalk and chert partings. The presence of the limestone and the conglomerate lenses form a good aquifer while the chalk and marl act as a good aquiclude. It consists mainly of unconsolidated and laminated marl with some siliceous sand. The Alluvium is characterized by the red color and fine texture which is due to its derivation from limestone. Sometimes it trends to be sandy and white which arise particularly in the area of sandstone exposures.