A faithful reader of Just Genesis is taking a course on China at Harvard. Here is the link the professor uses to explain the "peopling of the world." It is very well done and sound factually, though a little out of date. I hope the resource will be updated. http://www.bradshawfoundation.com/journey/
Note that the point of Man's origin is Africa. This is also the point of origin of the Edenic Promise (Gen. 3:15) and the point of origin of Abraham's ancestors.
The rulers listed in Genesis 4 and 5 pertain to the late Holocene so when we meet Kain and his brother Seth, we are at the end of the video.