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Grand Canyon National ParkSunset at Grand Canyon National Park
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Grand Canyon National Park
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Cell phone audio-tour logo shows a brown phone.
Your phone: a fun way to learn about the park.
Listen to park rangers give short audio tours at points of interest.
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Grand Canyon Podcast Directory
iPod and iPhone owners
Visit the Grand Canyon National Park Podcast Directory
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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: March 19, 2009 at 15:57 EST