Aesculus seeds were traditionally eaten, after leaching, by the Jōmon people of Japan over about four millennia, until 300 AD.
The earliest known archaeological evidence of the bean comes from the Awazu-kotei Ruin (Shiga prefecture) of the Japanese mid-Jōmon period of 4000 BC, and later occurs commonly in many Jomon sites of between 4000 BC and 2000 BC in Japan.
The earliest records of the domesticated form date to 2000 BC from the Jōmon period of Japan.
For finds from the Jōmon period or later, structures were originally made by digging below the then-current surface, causing changes in soil composition that make it much easier to discern fakes from real finds.
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It was later revealed that Fujimura's hoax extended beyond the paleolithic era to include Jōmon period artifacts as well.
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