Two wave theory & the New World

I read the paper that Afarensis pointed me to, Cranial morphology of early Americans from Lagoa Santa, Brazil: Implications for the settlement of the New World. I found it somewhat persuasive. The authors basically posit two primary waves of humans that settled the New World, a "generalized" form that entered before 10,000 years BP, and a specialized "Mongoloid" form that we know as Native Americans who arrived around 10,000 years ago. As John Hawks notes, this model has been proposed for other regions of the world. In regards to "specialized" human populations, The Real Eve Stephen Oppenheimer spends a lot of time trying to scry the origins of "Mongoloids," and he really comes to no good answers. They seem to simply arrive within the last 10,000 years and explode onto the scene (it could be argued that Mongoloids are the most numerous race of man). We know that there is ...