TheSearcher, on 06 February 2013 - 09:16 AM, said:
The Pedra Furada site in Chile, which contained human remains and hearths, preceded the Clovis culture and the other sites already mentioned, by 19,000 to 30,000 years. Having said this, this particular site has become an issue of contention between North American archaeologists and counterparts from Europe. For some reason north American archaeology considers anything older than 10,000 years suspicious.
Pedra Furada is an interesting site, but it's highly problematic. Its later material, which includes rock art, good artifacts, and even human remains, do substantiate a significant human presence in the area for a long period. But the more extreme dates (some of which go back to the limits of carbon dating c.50-60kya) are less easy. They involve charcoal and questionable artifacts. The former doesn't necessarily derive from humans since fires start naturally, while the latter are often ambiguous. So many scholars dismiss these as natural fires and geofacts, which isn't surprising given that the excavations occurred 20+ years ago in Brazil.
But another difficulty is in the larger chronology. How did modern humans get there that fast? According to the available archaeological evidence, It was only ~40kya that modern humans made it to Europe and Australia, and ~30kya for Siberia.
So either the Pedra Furada dates are wrong, or they represent evidence for an earlier species of
Homo in the New World.