Yoldia stage - the least clear interval in the Baltic Sea history

At the end of the Pleistocene, the present-day Baltic Sea was a big ice-dammed or ice-influenced (Baltic Ice Lake) lake with complicated water-level fluctuations. The drop of the Baltic Ice Lake at Billingen in central Sweden about 10 300 yr BP resulted in the drainage of 25-30 m. Evidence is provided of the catastrophic lowering of the water level by at least 25-30 m at the end of the Ancylus stage about 8500 yr BP.