Prior posts have noted the slowly mounting evidence that the "Clovis first" hypothesis is flawed (that is, that people with a uniquely sophisticated fluted blade were the first human occupants of North America and came to North America between 13,100 and 12,800 years ago). A number of sites in North America and one in Chile have established that people were living in the Americas earlier than 13,000 years ago.
Researchers have recently assisted with the demise of the hypothesis by unearthing 56 stone tools and thousands of flaky rock bits from a site near Austin, Texas. The new find dates to between 13,200 and 15,500 years ago. The researchers, so far, have found no evidence regarding the number of indivduals who occupied the site.
A report on the discovery can be found at http://www.sciencemag.org/content/331/6024/1599.abstract.