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But it wasn't until now that scientists were able to accurately date the findings, and possibly rewrite the history of the New World as we know it.
"This is a whole new ball game," Steve Holen, co-director of the Center for American Paleolithic Research and the paper's lead author, told CNN.
Evidence that they existed in the Southern Hemisphere has been mounting.
Today's announcement of a well-preserved fossil represents the first definitive evidence that dromaeosaurs roamed South America as well.
C, hunting peoples had occupied most of North America, south of the glacial ice cap covering the northern part of North America.
For now they want the general audience to see it and understand it, and for their peers to study it -- and even challenge it. is long before the ancient African is known to have occupied EAST ASIA."Buitreraptor is one of those special fossils that tells a bigger story about the Earth's history and the timing of evolutionary events," said Peter Makovicky, curator of dinosaurs at The Field Museum."It not only provides definitive evidence for a more global distribution and a longer history for dromaeosaurs than was previously known, but also suggests that dromaeosaurs on northern and southern continents took different evolutionary routes after the landmasses that they had occupied, drifted apart." The Buitreraptor fossil was found in northwestern Patagonia (the southern end of the South America continent) about 700 miles southwest of Buenos Aires.The scientists say they found what appear to be hammerstones and stone anvils at the site, showing that ancient humans had the manual skill and knowledge to use stone tools to extract the animal's Bone Marrow and possibly to use its bones to make tools.The site was named Cerutti Mastodon site, in honor of Richard Cerutti, who made the discovery and led the excavation.
The discovery changes the understanding of when humans reached North America.