Morphology, Function, Petrography and Provenance of Ground Stone Tool Assemblage from Niemczańska, Poland in the Light of Late Bronze Age Lithic Production in the Odra Basin

This paper presents results of morphological and petrological analyses of ground stone tool assemblage acquired from late Bronze Age settlement site at Niemczańska, Wrocław, Poland. The collection of six tools is functionally and petrologically diverse but comparable in terms of physical and mechanical properties, i.e. hardness and wear resistance. Exclusively hard and quartz-rich rocks were selected for tools production (granites, gneisses and sandstones). We applied complementary approaches: polarizing optical microscopy with modal mineralogical analyses, scanning electron microscopy and electron probe microanalyser for the petrographic and raw material provenance study. The results of our observations lead to the conclusion that raw material was collected locally from the surface deposits associated with glacial erratics brought to the area during MIS-16 to Saalian glaciations from Sweden and Åland Islands. Our observations confirm that erratics were a common source of raw material for the Odra Basin populations during the Bronze Age instead of autochthonic Sudetic or allogenic materials. Agricultural (grinder and grinding disc) and non-agricultural (whetstone, pad/fragment of a grinding disc, grinder and smoother) functions are recognised, based on morphological observations and use-wear traces. Three activity zones are distinguished at the site – production, habitation and possible cult zone with lithic tools spread within production and habitation zones.