New data on shoreline displacement and archaeological chronology in Southern Ostrobothnia and Northern Satakunta
Abstract
Shoreline displacement in southern Ostrobothnia (Pohjanmaa) and northern Satakunta was studied by using recent sediment, pollen and diatom data supplemented by radiocarbon dates from 12 lake basins at various altitudes that were successively cut off from the Baltic. The shoreline displacement shows a very rapid regression of more than 100 m from deglaciation to about 8000 B.P. after which a distinct retardation took place.
Two new stratigraphical Litorina sites, Lake Kalliojärvi (47.7 m) and Lake Tuorilampi (29.3 m a.s.l.) are reported here to supplement the earlier results. The stratigraphy of Tuorilampi shows a possible transregression around 3000 B.P., but the topographic reconstruction suggests a river estuary situation at that time.
The Stone Age coastal dwelling places from southern Ostrobothnia are dated with this shore displacement curve on the basis of their altitudes, and the chronology of different stylistic phases from the Mesoliticum to the Late Sub-Neolithic Kiukainen culture is thus obtained. The results are in accordance with the chronology obtained earlier by the time/gradient method. There are, however, some overlapping dates at Middle and Late Comb Ware sites.
