Stratigraphic profiles of the Morsott Holocene deposits, showing the sampling locations and extent of the malacological zones. Systematic sampling is shown in Figure 2 by black dashes. Coarse and fine deposits represent the alteration products in the Morsott region, an indication of a change in climatic conditions and sedimentation, the passage between coarse basal deposits rich in calcareous encrustations of Pleistocene age. at the base, with alternating sandy and silty loamy levels rich in snails at the summit, indicating the passage to a Holocene period more favorable to life.