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June 8, 2011
Photographed by one of the STS-91 crew members aboard the Space Shuttle Discovery, this area northwest of Monterrey, Mexico is a good example of a tectonic landform where the Earth's crust folds in a "wrinkled-rug" style. The Sierra Madrid Oriental is the easternmost extension of the North American Cordillera. The complicated structure of this arid region is the affects of wind eroding the softer rocks and leaving the harder ones making it look like it may be a photo of another planet. Monclova, Mexico is located near the center of the photo.

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