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The Holocene
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Deglaciation, shore displacement and early-Holocene vegetation history in eastern middle Sweden

S. Wastegård

J. Björck

J. Risberg

Stockholm University, Department of Quaternary Research, S-106 91 Stockholm, Sweden

The sedimentary record at Lake Vibysjo lake basin is situated close to the Närke Strait where the main water exchange occurred between the Vänern basin and Baltic basin during the middle and late phases of the Yoldia Sea stage of the Baltic Sea (c. 10 000– 9500 14C years BP). The area was deglaciated in a glaciomarine environment, as reflected by the occurrence of benthic calcareous fossils (foraminifera, ostracods and the mollusc Portlandia arctica (Gray)) in the lower-most clay units. The estimated date of deglaciation, 10 440 clay-varve years BP, suggests that a saline bottom-water current entered the Baltic basin shortly after the high areas south of Lake Vibysjön became free of ice. The brackish water fauna occurs during a regional Betula-Empetrum-Hippophaë pollen zone, which in southern Sweden is correlated with the early Preboreal. The isolation of the Lake Vibysjön basin is dated to 8100 14C years BP, and occurred during the last part of the Ancylus Lake stage. Based on investigations of other basins in Närke, it is concluded that the Mastogloia Sea reached c. 62 m a.s.l. and that the Litorina Sea reached at least 60 m a.s.l. in the area studied.

Key Words: Benthic calcareous fauna • foraminifera • ostracods • mollusc • Yoldia Sea • Preboreal vegetation history • shore displacement • Närke • Sweden • early Holocene

The Holocene, Vol. 8, No. 4, 433-441 (1998)
DOI: 10.1191/095968398677783843
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