• View of Grand Canyon National Park at sunset from the South Rim

    Grand Canyon

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River Trip Orientation Video Chapter 6

Grand Canyon Wildlife
 

 

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Did You Know?

GRAND CANYON ROCKS

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 estimate the age of Earth at 4.5 billion years.