Lake Lisan

The first stratigraphic study of the sediments was carried out by Picard in 1943 who developed a chronology he called the Lisan series.

It was not until later studies were carried out at lake level that a more detailed chronology of the lacustrine record was developed.

[6] These studies determined the highest stand of the lake to be around 160 metres below sea level at around 24,000 to 26,000 BC.

when it formed a complete lake all the way along the Jordan Valley, approximately 200 metres higher than the current level of the Dead Sea.

[7] Climatic and tectonic changes caused the level in the Jordan Valley to fluctuate into the Holocene, leaving Lake Beisan in the basin around Beit She'an still extant into the Bronze Age.