SHORELINE DISPLACEMENT AND VEGETATION HISTORY ON ISLAND NAISSAAR, BALTIC SEA

A comprehensive study of peat and lacustrine sediments from Bletkarri Mire (Naissaar Island, Estonia) was performed using pollen, diatom and C-14 analyses. Naissaar Island is situated in the Gulf of Finland (ab out 10 km north from Tallinn) on the North-Estonian coastal plain. The objectives of this study were to determine the time of the isolation of the lagoon from the Baltic Sea, establish the developmental history of the island and to reconstruct the vegetational dynamics under natu ral conditions as well as under human impact during the last millenniu m. Due to the land uplift, prior shore lines can be observed up to a h eight of about 26 m a.s.l Organogenic deposits started to form in a sm all lagoon isolated from the Baltic Sea about 5,000 BP. Calculations s how that emergence of the island started 7,500-7,700 BP during early L itorina Sea stage and areas lower than 15 m a.s.l. formed during the L imnea Sea stage. This is in good accordance with data from Hiiumaa Isl and and NW Estonia.