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desert pavement

surface of angular, interlocking fragments of pebbles, gravel, or boulders in arid areas. Desert pavement forms on level or gently sloping desert flats, fans, or bajadas and lake and river terraces of Pleistocene age (approximately 12,000 to 1,800,000 years old)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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