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Keywords:American Southwest, Arizona, Colorado Plateau, Colorado River, Desert Southwest, Four Corners, Grand Canyon National Park, Marble Canyon, Nankoweap Canyon, Redwall Limestone, Sediment, Sedimentary layers, ancient, cilffs, color image, colorful, daytime, eroded, erosion, geologic time, geology, horizontal, meanders, nobody, outdoors, photography, reflection, river, rocks, rocky, sand bars, strata
