Archaeological background of ancient Lake Päijänne and geological dating of the meso-neolithic boundary in Finland

The elevation of the Ancient Lake Päijänne transgression maximum has been studied with the aid of 27 datable Stone Age shore-side dwelling places. The transition from the Mesolithic Stone Age to the Neolithic Stone Age and the change of the discharge channel of Ancient Päijänne from the Hinkua river to the Kymi river were almost simultaneous occurrences. The absolute age, expressed in C14-years, is in the order of 5 810 + 70 years. The transgression niveau is supposed to be nearly linear