Bottom deposits and sedimentation in northern Airisto in Southwestern Finland

The sediments of the latest sea-phases, Litorina and Postlitorina, which together are called Litorina in this paper, could be easily distinguished almost everywhere from those of the earlier lake-phase, Ancylus, on the basis of the water content, the organic matter content, the grain size, and the diatoms. On the basis of the quality of bottom surface sediments, areas of erosion and accumulation can be roughly separated from each other. Wave action is at present the most important eroding factor in the examined area, but stream channels can also be seen.