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Pondering The Age Of The Grand Canyon

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Last month geologists published a paper in the journal Science that concluded the Grand Canyon -- or at least part of it -- is much older than most researchers think.

The study reopened a contentious debate among scientists. And it got reporter Laurel Morales thinking about the magnitude of the Grand Canyon’s history.

On a recent crisp, and perfectly silent evening, she takes us to the canyon’s south rim to walk the “Trail of Time” -- a path that encourages visitors to ponder the mystery.