March 05/2007 National Geographic Image
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2007
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March 05/2007 National Geographic Image
Sands of Time
A history book of the early Jurassic period, the sandstone formations of the Coyote Buttes were massive dunes 180 million years ago. Formed from the sandy sediments of the eroding Appalachians, far to the east, the dunes were then repeatedly submerged by inland seas.