Winter arrives in the San Luis Valley and Sangre de Cristo Range which are separated by a 20,000-foot normal fault. Looking across the less-obvious parabolic dunes in the dried sagebrush to the transverse dunes with reversing crests. The Great Sand Dunes National Park and Preserve claim to hold the highest dune in North America which is the height of a 70-story building—20 stories higher than the tallest building in downtown Denver. The igneous, sedimentary, and metamorphic rocks of the Sangre de Cristo Range exceed 14,000 ft (4267 m) above mean sea level in ten of its peaks, attesting to its young uplift. Photo credit: Vince Matthews.

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