The Djebel Nafusah Cliff forms very continuous outcrop (300km Long) and can be traced from Libyan Mediterranean coast to southern Tunisia. The cliff is armed by Mid Cretaceous limestone's which prevent underlying Mesozoic series from erosion.

The Mesozoic series starts with Triassic deposits and ends in Maaestrichtian. In the central part of the djebel, a homogeneous sandy series unconformably rests over the pre-existing Mesozoic series and corresponds to the so called Cabao Formation. It is exposed in numerous quarries as well as in natural outcrops. It unconformably overlies the Shekshuk Fm. most likely of Oxfordian age.

In Tunisia, additional stratigraphic units onlap the Austrian unconformity such as the Bouloula and Douiret Formations, Ouaja et al (2002); laterally equivalent units also occurs in western Libya near Wazin.

The Cabao sandstones seems to grade into Chenini sandstones in southern Tunisia, however the relationship is not well constrains and ancient data tends to suggest a north westward pinchout of the lower part of this formation, Bouaziz et al. (1989).

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