about 20000-12500yrs ago. Chinese are ice-age bleached black africans.
https://www.thoughtco.com/the-last-glaciation-1434433
Dalits are africans or mix of negroid&australoids . A few says ago, I saw a very dark skin person(curly but no pepper corn hair) murmuring some kind of prayers in the street. I right away ID'ed him correctly a tamil. He said he was chanting some christian prayer in Tamil.
http://www.africaspeaks.com/reasoning/index.php?topic=4964.0;wap2