University of Lodz, University of Lodz - Faculty of Geographical Sciences, Adam Mickiewicz University, University of Lodz - Institute of Archaeology, University of Szczecin, University of Wroclaw, Adam Mickiewicz University, affiliation not provided to SSRN, University of Warsaw, University of Lodz, Laboratory of Absolute Dating, University of Lodz, Polish Academy of Sciences and University of Lodz