The oldest confirmed site of human habitation in the Americas has been found at a dig  just north of Austin, and it's forcing scientists to rethink theories on who the first North Americans were, where they came from and how they got here. 

Archaeologists have long believed the first North Americans were Asians who walked across the Bering Sea landmass into North America about 13,500 years ago, at the end of the last Ice Age.

Those tribes have been named the "Clovis People", for the area near Clovis, New Mexico, where some of their artifacts were found in the 1930s.

The recent Texas discovery, reported in the journal Science, may definitively prove humans migrated into the Americas long before the "Clovis" people got here.  The discovery also suggests the first Americans may not have come in over the Bering Sea landmass, but in boats along the Alaskan and Canadian coasts as long as 16,000 years ago.

That's because - at that time - much of North America was still covered by a sheet of ice several miles thick, and coming in over land would have been almost impossible.

via Scientists: The first Americans may have been Texans | Houston & Texas News | - Houston Chronicle.

Read more about this discovery and its implications in the Science Daily.