[Ed. – The last update on this was based on human fecal matter that seemed to be 14,000 years old, found in Oregon.]
Ancient human artifacts found in a remote corner of Northwestern Idaho could deliver a major blow to a long-held theory that North America’s first humans arrived by crossing a land bridge connected to Asia before moving south through the center of the continent.
The artifacts have been dated to as far back as 16,500 years ago, making them the oldest radiocarbon dated evidence of humans in North America, according to research published Thursday in the journal Science.
The artifacts are part of a trove discovered where Cooper’s Ferry, Idaho, now stands. They are a thousand years older than what has previously been considered North America’s most ancient known human remains.