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Biostratigraphy (Foraminifera) and tectonic control in the Upper Cretaceous series of Mejez El Bab area (Northern Tunisia). The biostratigraphical analysis of the Cretaceous series which out crops in the Mejez el Bab area (Northern Tunisia) is based on the Foraminifera distribution found into numerous sections taken in this area (Jebel Kechtilou, Sidi Mohamed Akermi, Jebel Bou Rahal). This analysis permits to precise chronostratigraphy of different beds and to prove some thickness and fades changes and sedimentary hiatus in these area cretaceous series, The fades and thickness changes and the sedimentary hiatus would be linked to an active synsedimentary tectonics. The last one had structured the sedimentary substratum in horsts and grabens. In the first structures numerous sedimentary hiatus and thickness decrease are observed. In the second structures (grabens), the Vraconian-Coniadan series are thick, complete and continuous such as in Sidi Mohamed Akermi location ; there, we have recognized all biozona of the Vraconian up to Coniacian stage. However, in Jebel Bou Rahal and Kechtilou (Koudiat ed-Damous), the Vraconian-Coniacian series are thin and occur some sedimentary hiatus such as the Early and Middle Cenomanian, of the Late Turanian to Early Coniacian or only the Early Coniacian. These thickness decrease and sedimentary hiatus are underlined especially in some shoals limited by submeridian, N40 to N70 and N140 faults. Nevertheless, in Jebel Bou Rahal was developped intraformational breccia deposited during the Upper Cenomanian to the Middle Turanian.

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