Well there are other possibilities. Some time ago I found an article from a Brasillian newspaper that reported on a group (Botacudo) in Brazil that displayed a similar morphology. One of Walter Neves's grad students was working on it so we will probably get a craniometric paper soon.

As far as anomalous mtDNA is concerned, I am still waiting on a classification of the Windover Bog burials. That study has been going for over 10 years but still no firm classifications. The book that was published a couple of years ago had 2 chapters on DNA but spent most of the text discussing what the DNA did not match.

"The Stone Age did not end for lack of stone, and the Oil Age will end long before the world runs out of oil"

-- Sheikh Zaki Yamani