Grand Canyon's origin dated to 6 million years ago

By Ashley Yeager, 18:14 PM January 24, 2014

The age of the Grand Canyon has been strongly debated among geologists, with some estimating it formed up to 70 million years ago. New results from a rock-dating method, however, support the more traditional view that the Colorado River cut the canyon into its grand form more recently.

The rock-dating method measures when erosion brought deeper rocks to the Earth’s surface. One segment clocked in at 50 to 70 million years old and another at 15 to 25 million years old. But two segments were muc...

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