Between 900-800kBC was a bottleneck. Although, since no humans survived excepting the ancestors of Neanders and of us, this is a difficult call if it were a true wipeout of those other early hominids.
Our ancestors came out of a tribe of 1280 fertiles. Sharing chromosome-2, they think. These - in Africa - went to stem-1/stem-2, with the Neanders leaving Africa by the 600kBCs. Although protoNeanders may have branched off at the end of the cursed 800ks.
I vaguely remember some talk about Homo-antecessor in Europe, which was at first thought to be Erectus. And yeah: 700kBC, this coalmine, in southern Greece. These remains are considered not-Neander. How was their chromo-2? Honestly I have to suspect they are actual early Neanders.
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