THE BALTIC ICE LAKE YOLDIA SEA TRANSITION

The Baltic Ice Lake, the Yoldia Sea, the Ancylus Lake and the Littorin a Sea are the four classical stages in the postglacial evolution of th e Baltic basin. The picture is complicated by what concerns the detail s 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 la custrine phase of 300 years right after the drainage of the Baltic Ice Lake and before the ingression of salt water that, by definition, sig nifies the onset of the Yoldia Sea. During this lake stage, a fully la custrine `Ancylus-fauna' lived along the coasts of the islands of Gotl and and bland. For historical reasons and mistakes, we term this new s tage the 'Yoldia' Lake stage (thus avoiding too much reorganization).