Despite a growing recognition of late Palaeolithic and Mesolithic settlement in recent years, the area of Pojezierze Łagowskie still represents one of less known regions of western Poland, both in terms of Old and Middle Stone Age settlement and reconstruction of of contemporary environmental conditions. The article provides results of technological, typological, functional analyses, as well as that of raw materials used in stone industry of Mesolithic communities occupying sites 13 and 16 in Wilenko. Majority of functional tools is characterised by use-wear traces, which should be interpreted as results of variability of meat, bone, antler, and leather processing activities or game hunting. In the article an attempt has been made to reconstruct environmental conditions, on the basis of the results of pollen analysis.