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“This looks like people settling in,” agrees Loren Davis, an archaeologist at Oregon State University in Corvallis.

“As old as this is, you’re probably not looking at the first peoples on the landscape.” The Huaca Prietans managed to do all this with surprisingly simple stone tools.

The deepest pit, which took 5 years to excavate, reached down 31 meters.

Shockingly, those deep layers contained telltale signs of human occupation, Dillehay’s team reports today in : evidence of hearth fires, animal bones, plant remains, and simple but unmistakable stone tools.

Its crust is continually being created, modified, and destroyed.

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The evidence of early human occupation stunned Tom Dillehay, an archaeologist at Vanderbilt University in Nashville who led the new study.

The radioactive parent elements used to date rocks and minerals are: Radiometric dating using the naturally-occurring radioactive elements is simple in concept even though technically complex.

If we know the number of radioactive parent atoms present when a rock formed and the number present now, we can calculate the age of the rock using the decay constant.

Initially, he was interested in examining the mound itself.

But geologists on his team wanted to study the landform under the mound, so “we just kept going down,” he says.