John Wesley Powell

Tourists hike along the South Rim of the Grand Canyon with the North Rim in background, Arizona

Study: Grand Canyon formed during the dinosaur era

It’s the most common question visitors to the Grand Canyon ask: “How old is it?” A provocative new study suggests the natural wonder is much older than commonly believed. Using a new tool to date the age of rocks, a team of researchers contends the western section of the Grand Canyon may be 70 million years old.

11/29/2012

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