Marine sediments, mainly clay and silt, deposited at a water depth of 20-30 m are described. The base of the succession is radiocarbon dated to 12,220 ± 150 B.P., the upper part to 10,230 ± 180. The shells indicate water temperatures similar to those of northern Norway today. These shells and shells from other localities suggest that warm Atlantic water entered the Norwegian Sea prior to 12,600 B.P. The pollen diagram from the sediments has the same main trends as in diagrams from limnic sediments covering the same period, except for high percentages of Alnus. The age and correlation of several Late Weichselian events are discussed.
Late Weichselian marine sediments containing shells, foraminifera, and pollen, at Ågotnes, Western Norway