This description of the meteorite that killed the dinosaurs is a bit sobering.

[Burney]

Certainly not indigenous Africans, b.

The whiteys are all mad Dutchers and Rhodesians innit

Ah. So how long do you have to be there to be considered indigenous, would you say? After all, we're all indigenous Africans if you go back far enough, aren't we? And since people have this tiresome tendency to move about, any definition of indigeneity is going to be pretty arbitrary, isn't it?