Scientists : First People in Americas Arrived at Least 16，600
Stone tools and pieces of animal bone from about 16,600 years ago are the earliest evidence yet of human beings in the New World, scientists say.
The objects were found in the western United States.
They were recovered from an archeological site called Cooper's Ferry on the Salmon River near the town of Cottonwood, Idaho.
Scientists used radiocarbon dating methods to find out how old these artifacts are.
The scientists say people lived in or passed through the area at a time when ice covered large parts of North America.
That period of time is known as Earth's Ice Age.
During the period, big mammals like mastodons,saber-toothed cats and camels lived in North America.
Loren Davis is an anthropology professor at Oregon State University.
He led the team of scientists working at Cooper's Ferry.
A report on the study and their findings was published in Science magazine.
The Cooper's Ferry site is the earliest
radiocarbon-dated archaeological evidence in the America's, Davis said.
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