At https://www.livescience.com/archaeology/human-evolution/prehistoric-jomon-people-in-japan-had-little-to-no-dna-from-the-mysterious-denisovans-study-finds/ … the prehistoric Jomon people of Japan, going back at least until the end of the Late Glacial Maximum, has been found to have little DNA inherited from the Denisovans – who died out at the start of the Late Glacial Maximum. Around 30,000 years ago. Denisovans were found in Euroasian and seem to have left traces of their genes in many modern populations in East Asia, SE Asia, and the Pacific islands. Even amongst the native Americans. The small amount of DNA in the Jomon would appear to rule out a migration across the top of the world by Jomon type people. This appers to be why no trace of the Jomon among modern native Americans can be found. Or, that is one way to look at it.
Jomon people in Japan existed from 16,000 to 3,000 years ago. They may even survive in the Ainu, a small tribal group found in remote regions. Jomon were found to have the least DNA of all East Asians. People in China and Mongolia carried the most Denisovan DNA, the research discovered. This would make sense if Denisovans were primarily a central Asian population. It would seem the Jomon had a lost history between 30,000 and 16,000 years ago. However, they did have pottery – at a very early period.
The least Denisovan DNA was found in ancient populations that lived in what is now Iran and Georgia. However, Denisovan DNA does exist in modern Japanese, brought over by the migration of rice farmers. Via Korea.