Abstract. - During Holocene the winds have built dunes, ranging from 5 to 7 m high, and dug yardangs from 1 to 2m deep. The present ergs surrounding holo- cenes lake deposits were built in less than 4000 years. In the Araouane basin, the ablation caused by wind over 6500 years has been about 60 cm.
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Jean Riser (1985) studied this question.
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