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Making America's Best Idea Even Better
Grand Canyon National Parklightning storm at the canyon
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Grand Canyon National Park
Exhibit Planning
SDII GRCA 050109 front cover

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Schematic Design II   (16.3MB PDF File)
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.

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Last Updated: May 07, 2009 at 13:23 EST