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Article posted: 11/29/2012 7:22 PM

Just how old is the Grand Canyon?

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A new study suggests the Grand Canyon formed 70 million years ago, while other scientists disagree and believe the canyon was mainly carved by the Colorado River in the past 5 to 6 million years.

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The awe-inspiring Grand Canyon was probably carved about 70 million years ago, much earlier than thought, a provocative new study suggests — so early that dinosaurs might have roamed near this natural wonder.
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