Reconstruction of a latest Paleocene shallow-marine eutrophic paleoenvironment at Sidi Nasseur (Central Tunisia) based on foraminifera, ostracoda, calcareous nannofossils and stable isotopes (d13C, d18O) - Stassen, P. (K.U.Leuven. Department of Earth and Environmental Sciences) ; Dupuis, C. (Faculté Polytechnique de Mons) ; Morsi, A. M. (Ain Shams University. Department of Geology) ; Steurbaut, E. (Royal Belgian Institute of Natural Sciences. Department of Paleontology) ; Speijer, R. P. (K.U.Leuven. Department of Earth and Environmental Sciences)