Abstract

Abstract The Baltic Ice Lake, the Yoldia Sea, the Ancylus Lake and the Littorina Sea are the four classical stages in the postglacial evolution of the Baltic basin. The picture is complicated by what concerns the details of each of these stages. Between the Baltic Ice Lake and the Yoldia Sea it is necessary to introduce a separate lake stage; an entirely lacustrine phase of 300 years right after the drainage of the Baltic Ice Lake and before the ingression of salt water that, by definition, signifies the onset of the Yoldia Sea. During this lake stage, a fully lacustrine ‘Ancylusfauna’ lived along the coasts of the islands of Gotland and Oland. For historical reasons and mistakes, we term this new stage the ‘Yoldia’ Lake stage (thus avoiding too much reorganization).

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