Do these Nubian artefacts reflect a great migration of north-east Africans to the continent’s southern tip? Or are they the result of convergence in the face of finite possibilities?
For several reasons, we think that they reflect convergence. First, we could find no evidence of Nubian-like cores in the 6000 km between the classic Nubian belt and south-west Africa. If there was a great migration, it is one that left no evidence in the intervening space. Second, our artefacts likely occur some 15,000 to 60,000 years too late for the typical Nubian.
To put that in perspective, it would require people to maintain the same technology across 750 to 3000 generations, all the while moving from the Sahara across central Africa and down into the temperate zones of southern Africa.
Convergence, eh? I might be dissuaded of my uninformed, fanciful ideas soon.