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PROPOSAL OF A CHRONOSTRATIGRAPHIC SCHEME OF CONTINENTAL QUATERNARY INHERITANCES OF NORTHERN JEFFARA AND OF THE NORTH-ORIENTAL PART OF DAHAR-MATMATA PLATEAU (SOUTH-EAST TUNISIA)

Four to five terraces, a series of coalescent alluvial fans, two glacis of erosion and a glacis of substitution constitute the range of the Quaternary shapes in northern Jeffara. Given the geomorphologic, prehistoric and chronologic data, all deposits are dated from Upper Pleistocene and Holocene, except the calcareous crust attributed to the Lower Pleistocene and that seals the first erosion glacis, and the conglomeratic deposit with pudding, which can belong at the same time to Middle and Upper Pleistocene. Calcareous crusts, facies changes and arrangement of forms reflect the role of climate change in the Quaternary geomorphologic evolution of this nowadays arid area.