I am a biostratigrapher and micropaleontologist at the Geo-resources Laboratory, Water research and technologies Centre of Borj Cedria (Tunisia) since October 2007. I am particularly interested in the determination and the division of the geological time into biozones. Since 2013 I have added a second research focus: The delimitation of aquifers and the characterization of the water reservoirs by determining with precision the chronostratigraphy of the permeable formations and sedimentological composition.