You will be laughed at for at for using “antediluvian,” but one thing is certain. Human culture goes back a long,long way and even minimal honesty demands that they accept that most of the evidence remains unburied.
By who? Why?
Sea levels are higher today than they were 15,000 years ago. You can bet the folks who lost their homes as the glaciers melted weren't laughing.
The ocean was as low as it goes. Humans, as usual, lived on the flood planes of the slow flowing rivers, or near the shoreline ~ and that was about 400 ft deep in the present ocean.
With a small population they had no reason whatsoever to advance inland or uphill so whatever it was they did is little known ~ as yet.
Besides the inland areas were filled to the brim with giant elephants and enormous saber toothed tigers and dire wolves.
A guy could get et!
I suppose ANTIDILUVIAN is as good a name for it as any.
The earlier Neanderthal colonization of Europe was about 400,000 years back.
What I think has been discovered is the movement of a more highly cultured human group from Arabia back down into Africa during a short, previously unknown Saharian pluvial.
There's also the recent discovery that virtually all indigenous Africans have a quite serious gene group that comes from yet a different race which did not pass on any of those genes to Europeans, East Indians, or Andaman Islanders.
Some of the anthropoligists have suggested this other race was another version of the Neanderthalers ~ albeit a group living in Africa and pursuing a separate evolution.
It is possible the people returning to Africa bred (as is normal) with this other population to create today's current indigenous populations. The Sen people seem to be a separate race from all the others in Africa, but they are demonstrably related at the genetic level with the Europeans and East Asians.