Correlation of tills from the South-Eastern Baltic sea bottom and nearshore boreholes

Stratigraphic correlation and identification of tills is one of the most important problems of geological mapping of the South Eastern Baltic Sea (Lithuanian sector, Sventoji - Klaipe. da aquatory) and surrounding offshore area (northern part of Lithuanian Maritime region). Stratigraphic correlation of tills from the SE Baltic Sea bottom and near shore boreholes was carried out on the basis of results of geochemical investigations and data of morphological analysis of hornblende grains. Stratigraphic subdivision of till sections in boreholes and grouping of till samples from the sea bottom surface as well as stratigraphic correlation between boreholes till layers and sea bottom sample groups was completed using factor and cluster analysis. Stratigraphic interpretation of correlated geological strata was performed taking into consideration additional information, such as results of OSL dating and paleobotanical investigations of intermorainic deposits. It has been found that Saalian tills prevail in the geological sections of Quaternary deposits of Lithuanian Maritime region and dominate on the Baltic sea bottom surface of the northern part of the Lithuanian sector.