After A Cliff Collapsed In The Grand Canyon, Experts Made A Startling Discovery In The Rock

On a trail that winds its way through the red cliffs of the Grand Canyon, a geologist discovers a boulder fallen from a nearby cliff. Torn from an ancient rock formation, the huge stone contains an astonishing secret dating back millions of years. The geologist then snaps a photograph, intrigued by what he has spotted. And as he does so, he kickstarts a chain of events that will arguably change what we know about Arizona in prehistoric times.