Worn areas and Surface Topography
For optical observation, different scales of measurement were employed. Macro-scale analysis was conducted with a confocal microscope, which permits measurements of maximum amplitude of 3 mm with a resolution in Z of 10 nm. Micro-scale analysis was conducted with an interferometer which allows measurements with maximum amplitude of 1 mm and a resolution in Z of 2 nm. In each case, the dimension of the measured areas is adapted to the worn surface. Acquisition of quantitative and qualitative data are in this way acquired on wear surfaces: infra is shown a 2D image of a tool in contact with a bamboo using a longitudinal motion. Statistical parameters allow the comparison of different surfaces, the morphologies are discussed in term of mechanisms of wear. These methods are employed to characterized wear on flint and obsidian tools to complement use-wear analysis which is a qualitative approach based on microscopy at different scales. Tribological analysis has been recently employed in a pilot study of the technological steps involved in shaping and polishing of an obsidian bracelet. This artefact was found in the earliest level of the Aceramic Neolithic site of Aşıklı Höyük, in Central Anatolia (8300-7500 cal. BC). Several other studies are in process on lithic tools and prestige objects.