AEOLIAN SEDIMENTATION AND CLIMATIC CHANGE S IN THE ATLANTIC MOROCCO BETWEEN THE TENSIFT AND MASSA-WADIS (30-32-DEGREES-N) SINCE 20,000 YEARS BP

At latitudes of the northern Sahara (N30-32-degrees), aeolian deposits have been prevalent since 20,000 y. BP along the Atlantic coasts of M orocco. In the late upper Pleistocene, westerlies reworked biodetrital sands from the emerged continental plateau and deposited carbonate du st up to one hundred kilometres inland. Then, after the fixing of the sand dunes, the incrusting of a calcrete (ca. 14-13,000 y. BP) and a r un-off reworking, the aeolian siliceous silts deposition began in wett er conditions, related with Saharan wind transport (from 9,800 to 3,50 0 y. BP). Similar data have been obtained on a larger area (N28-34-deg rees).