Highlight of Middle-Late eocene compressional events in the subsurface of eastern Tunisia (Sahel):: Generality of the Atlasic phase in North Africa.

Compressional events are well recognized, in the Subsurface of the Sahel foreland basin in eastern Tunisia, evolving toward the Palaeogene sedimentary cover. These events are expressed by folds, inversional structures and a set of angular unconformities. The compressional events that started in the Campanian-Maastrichtian continued through the Palaeocene and attempted their paroxysm in the Lutetian-Priabonian prior to the angular toplap unconformity of the Oligocene series. On the other hand, the Oligo-Miocene series recorded tectonic quiescence events expressed by extensional tectonics. The tectonic events recorded by the Palaeogene series are well correlated to the major events recognized in eastern Algeria, especially the Atlasic event (Lutetian-Priabonian), which must be considered as a major tectonic event largely expressed in the whole Atlasic domain of North Africa.