sentences:  An elongated peninsula jutted into the lake from the western shore and smaller peninsulas existed on the northern and southern shores towards the eastern side of the lake.Blue clays in boreholes and fine grained mud and sand on the former shores testify to the existence of a lake there.The highest shorelines are dated to 24,400 ± 2,190 and 25,000 ± 310 radiocarbon years ago; further dates are 40,460 ± 550 and 33,830 ± 340 calibrated radiocarbon years ago.