The prehistory of Western Sahara in a regional context: the archaeology of the "free zone"..Rock-art: prehistoric engravings on stone slabs in open air near track running from .Tindouf/Rabuni to Bir Lahlou and Tifariti. Estimated age of engravings: 4000-2000 before present, possibly earlier. Faunal assemblage.Rock substrate: Devonian sandstone
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