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Evolution holocène de la Tunisie saharienne et présaharienne

Abstract : Tunisian saharian and presaharian Holocene period can be divided into four subperiods. Lower Holocene (10 000 B.P. to about 7 000 B.P.) is characterized by increasing humidity (stabilization of dunes, reappearance of lakes, accumulation of lower terrace and genesis of Holocene glacis). A short dry phase probably took place between 7 500 and 7 000 B.P. Middle Holocene (7 000 - 3 500 B.P. ?) is probably the climatic optimum subperiod (end of lower terrace building up, pedogenesis developping and evidences of good hydrological conditions). A progressive climatic aridification began during prehistoric upper Holocene (cutting-down of lower terrace and deflation). A probable short humid phase about 2 400 B.P. marked the beginning of historic upper Holocene that is characterized by building up then cutting-down of very low terrace and, last, by mobilization of aeolian sands due to desrtification.
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Jean-Louis Ballais. Evolution holocène de la Tunisie saharienne et présaharienne. Méditerranée : revue géographique des pays méditerranéens, Publications de l'Université de Provence, 1991, 74 (4), pp.31-38. ⟨10.3406/medit.1991.2735⟩. ⟨hal-01562627⟩

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