This formation refers to the upper part of the lower Cenomanian and is exposed mainly west of the Fara'a anticline, where it consists of dolomite, marly and chalky limestone. The formation is moderate to good aquiclude except in the dolomite and limestone areas where the karsts caves are active. It is considered as a good aquifer. It forms the upper part of the middle Cenomanian. Outcrops exist west of the Faria'a anticline.
Lithology is marked mainly by the blue-green and dolomite limestone.
Limestone rocks are massive at the base and become well bedrock upwards. The high jointed limestone renders the formation of excellent aquifer. This formation is regarded as the upper Cenomanian. Outcrops are found mainly on the flank of the A'nabta anticline. The lithology is characterized mainly by limestone and dolomite with chalk and marl.