Archaeologists found traces of submerged Stone Age settlement in Southeast Finland
August 8, 2018, University of Helsinki
A prehistoric settlement submerged under Lake Kuolimojarvi provides researchers with a clearer picture of the human occupation in South Karelia during the Mesolithic and Early Neolithic Stone Age (about 10,000—6,000 years ago) and opens up a new research path in Finnish archaeology.
In the early Stone Age, the water levels in the small lakes located in the southern parts of what are today Lake Kuolimojarvi and Saimaa were several metres below present levels. After this period, the water levels started rising as a result of uneven land uplift, and the tilting of lakes and rivers. The rise in water levels ended with the outburst of River Vuoksi through the Salpausselka Ridge about 6,000 years ago, when water masses carved a new southeastern outflow channel towards Lake Ladoga.
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https://phys.org/news/2018-08-archaeologists-submerged-stone-age-settlement.html#jCp