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satellite image along the Texas (right) and New Mexico (left) border. An orange border overlay outlines the Guadalupe Mountains National Park in which McKittrick Canyon resides and is in the center of the image. Diagonally down and left on this dark colored mountain range is El Capitan, and to the left of that are light colored smooth formations labeled dunes. In the upper right corner of the image is another orange outline for Carlsbad Caverns National Park.

Mountains Made of Fossils

The peaks in Guadalupe Mountains National Park—some of the highest in Texas—are made of a well-preserved fossil reef formed more than 250 million years ago.

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