Shallow marine deposits characterize the upper Albian – lower Cenomanian of Northern Algeria. In Djebel Azzeddine (Ouled Nail Mounts), corresponding sediments have been subdivided into three distinctive units A to C. The first discovered ammonite fauna from Bou Saada area allowed attribution a part mid-Cretaceous post-Continental Intercalaire Albian. ammonite-bearing level indicates maximum flo...

The biostratigraphic distribution of orbitolinids for the Barremian SE France proposed hereafter is calibrated on ammonite biozonation. This work based study eleven sections with associated to macrofossils (ammonites and/or echinids) significant in terms biostratigraphy or overlain levels bearing above macrofossils.