Microdistribution and composition of usewear polish on prehistoric stone tools

The use of prehistoric stone tools can be classified according to the usewe ar traces on the tool working edge. The polish resulting from the use of th e tool contains minute amounts of the original worked material. Using the m icro PIXE mapping technique, a comparative study of a set of experimental t ools and a set of mesolithic end-scrapers was performed. For both sets of t ools, increased concentrations of elements associated with the worked mater ial were found in small localized regions. The composition of these regions was probed by point measurements and two main groups of P, Ca and S, It co mpounds were identified. The X-ray attenuation in the polish layer suggests that the deposited elements diffuse into the bulk flint. (C) 1999 Elsevier Science B.V. All rights reserved.