Problems with radiometric dating methods over 4o dating

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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.

It has a long head and long tail and wing-like forelimbs.

Its serrated teeth, like steak knives, suggest it was a carnivore.

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.

Both belong to a class of birdlike dinosaurs that ran swiftly on two legs and are called dromaeosaurs.

It has been widely accepted that groups of peoples entered the American hemisphere from northeastern Siberia, perhaps by a land bridge across the Bering straits of Alaska that might have existed then, (This at some time in the Late Pleistocene, or Ice Age).

There is already abundant evidence that by 11,000 B.

Advanced radiometric dating technology allowed scientists to determine the mastodon bones belong to the Late Pleistocene period, or 130,000 years old, with a margin of error of plus or minus 9,400 years."The bones and several teeth show clear signs of having been deliberately broken by humans with manual dexterity and experiential knowledge," Holen said in a press release.

Experts agreed that the earliest records of human ancestors in North America is about 15,000 years old, but the discovery of the Cerutti site "shows that human ancestors were in the New World ten times that length of time," said paleontologist Lawrence Vescera.

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