Pre-Clovis occupation 14,550 years ago at the Page-Ladson site, Florida, and the peopling of the Americas

http://advances.sciencemag.org/content/2/5/e1600375.full 

Pre-Clovis occupation 14,550 years ago at the Page-Ladson site, 
Florida, and the peopling of the Americas 

Abstract 

Stone tools and mastodon bones occur in an undisturbed geological 
context at the Page-Ladson site, Florida. Seventy-one radiocarbon 
ages show that ~14,550 calendar years ago (cal yr B.P.), people 
butchered or scavenged a mastodon next to a pond in a bedrock 
sinkhole within the Aucilla River. This occupation surface was 
buried by ~4 m of sediment during the late Pleistocene marine 
transgression, which also left the site submerged. Sporormiella 
and other proxy evidence from the sediments indicate that 
hunter-gatherers along the Gulf Coastal Plain coexisted with and 
utilized megafauna for ~2000 years before these animals became 
extinct at ~12,600 cal yr B.P. Page-Ladson expands our 
understanding of the earliest colonizers of the Americas and 
human-megafauna interaction before extinction. 

Pre-Clovis occupation 14,550 years ago at the Page-Ladson site, Florida, and the peopling of the Americas