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A 95% sample of lithic debris from Wadi Hasa Survey Site 1065, a radiometrically-dated series of Kebaran and Natufian base camps with midden deposits and structures in the Wadi Hasa (west-central Jordan), is analyzed to evaluate the remaining integrity of a geologically old archaeological surface. Structural and compositional characteristics of the surface array (63,800 pieces) are compared with excavated samples (89,539 pieces). Methods used to detect aspects of structure in the surface component include density distribution maps of debitage and retouched pieces and cluster analyses of spatial units using tool groups.