A key archaeological site in Chile faces a challenge

A new study challenges a site that's crucial to our understanding of how people got to the Americas.

Decades ago, a site in Chile called Monte Verde was dated to about 14,500 years ago.

That put to rest theories about the ancient Clovis people being the first to arrive.

A new study, though, contends that Monte Verde may be much younger than believed, at about 8,000 years old.

The researchers think changes to the landscape, including a stream wearing down the rocks, may have mixed older layers with new.

But not everyone agrees with the findings.

The study was published Thursday in the journal Science.