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Grand Canyon's 55-Million-Year-Old Secret Monday, April 14, 2008 - Ehud Rattner Home >> Headlines >> General Science   
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Visitors are often told that the Grand Canyon formed 6 million years ago, when the Colorado River assumed its current course. But a new study indicates that a large chunk of the Grand Canyon may have taken its shape from a far more ancient gorge, carved out 55 million years ago by a river flowing in the opposite direction. New dating of the canyon's Upper Granite Gorge suggests that this older, 1,000-meter-deep gorge may have been a rough template for the eastern third of the Grand Canyon. (source: nature.com)
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