As we're (well, HBDChick was, some days ago) talking about Early Man: Emily Y. Hallett et al. This deals with "human niche" versus the north and east African habitat-types.
This paper notes that we humans - and Denisovan humans - were already capable of symbolic language through tool specialisation in "MIS 5", which "5e" includes the close of the Eemian 120ka+. But we hadn't used these tools to get far into the Sahara, nor into the jungles. After the Eemian, the climate reverted Pleistocene.
Say they: the human niche progressively expanded to include more habitat types beginning around 70 ka and that this expansion peaked at about 50 ka
. 70 ka will be when Takarkori.
So if we could do symbolism and we could live in various environments... what took so long? They seem to be arguing for a "critical mass" of bare human numbers. Tribes of thirty couldn't outdo the wilderness. Tribes of three hundred, could.
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