Researchers have found that the hills were filled in the Neolithic about 5500 years ago.
The cairns may belong to glass houses, which are also deep underwater and are still awaiting a discovery, the Thurgau Archeology Office said Friday. But it could also be that the habitat piles "were completely destroyed by the action of the sea".
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The Office of Archeology reports "sensational results" after landing at the bottom of the lake. The diving team discovered a two-meter-wide profile strip. Several trees, some of which were decorated with chickens made of poplar and ash wood, confirm that the stone setting was erected by humans.
Over the next few months, the Office of Archeology will complete documentation of underwater discoveries and remaining analyzes. Then, an international team of researchers should evaluate the results and publish them in a scientific publication.
Discovered in 2015
The cairns were discovered in 2015 by the Langerhengen Lake Research Institute (D) for depth measurements. The hills each have a diameter of 15 to 30 meters and are at regular intervals near the shore, about four and a half meters under water.
On September 19, boat investigators brought a 30-ton excavator with a 15-foot arm to Hill 5. There they dug a cut through the stone, at right angles to the shore. This special creature was then examined more closely by divers. In the middle 50 centimeters thick hill 5 is directly above the fine post-glacial lake sediments, it is said. "Initial results from radiocarbon measurements suggest that Phil 5 was buried in the Neolithic about 5500 years ago."