Japanese archipelago and Japanese
Humans were born on Earth in the Late Miocene of the Neogene in geology, which is about seven million years ago. Humankind developed from near the end of the Neogene to Quaternary, which is divided into the Pleistocene and the Holocene by about 10,000 years ago. The Pleistocene is also called the Glacial Age, where cold glacial periods and relatively warm interglacial periods alternated. During the glacial period, the sea level dropped significantly compared to today.
It is assumed that the Japanese archipelago has been connected with the northeastern part of the Asian continent at least twice during this period and Stegodon and Naumann elephants have arrived there. Humans may have come to the Japanese archipelago following these large animals, but no definitive evidence has yet been discovered. The sea level rose in Holocene after the last glacial period, and the Japanese archipelago, which was almost in its current form, was established about 10,000 years ago.
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※reference: 改訂版 詳説日本史 (山川出版社)
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