I just returned from Japan and have found a lot of interesting information like Japanese archipelago has been traced to prehistoric times
Japanese archipelago? is that in the northern region?
No it means the islands that makes up Japan. Have you heard  of the Jōmon period?
oh ok.  no, never heard of Jomon period
History of Japan
The history of Japan covers Japan and its relation to the world. It is characterized by isolationist, semi-open and expansionist periods.
Please see the era classifications for details of each era.
The very first human habitation in the Japanese archipelago has been traced to prehistoric times around 30,000 BCE. The Jōmon period, named after its "cord-marked" pottery, was followed by the Yayoi in the first millennium BC when new technologies were introduced from continental Asia. During this period, the
Subsistence-Settlement systems in intersite variability in the Moroiso Phase of the Early Jomon Period of Japan"
- Hudson, Mark J., "Ruins of Identity: Ethnogenesis in the Japanese Islands", University of Hawai`i Press, 1999,
- Imamura, Keiji, "Prehistoric Japan", University of Hawai`i Press, 1996,
- Kobayashi, Tatsuo. (2004). "Jomon Reflections: Forager Life and Culture in the Prehistoric Japanese Archipelago". Ed. Simon Kaner with Oki Nakamura. Oxford, England: