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Grand Canyon National ParkView down on the Colorado River from the Redwall Rim
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Grand Canyon National Park
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GRAND CANYON ROCKS  

Did You Know?
The more recent Kaibab limestone caprock, on the rims of the Grand Canyon, formed 270 million years ago. In contrast, the oldest rocks within the Inner Gorge at the bottom of Grand Canyon date to 1.84 billion years ago. Geologists currently set the age of Earth at 4.5 billion years.

Last Updated: October 23, 2006 at 14:29 EST