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Algonkian ancient Apus Archean Arizona become birds bottom Bright Angel buttes called cinder cliffs Colorado course creatures deer desert dinosaurs earth fact Farther journey flourishing flowers forest fossils geological geologists GRAND CANYON grow Hopi hundred feet hundred miles Indians inhabitants inner gorge Jacob Lake John Hance Kaibab limestone Lake Mead land layer least less Little Colorado living longer longest ten miles look meadow Mesozoic million Mormon mountains mule national park Navajo Navajo Bridge never north rim world obviously once Paleozoic perhaps Permian Phantom Ranch pine plateau population Powell probably recent Redwall region river road rocks San Francisco Peaks sand sandstone sawflies seems seen shale slope sometimes south rim species squirrels stone stream Sunset Crater surface things thousand feet tion tourist trail trees trilobites valley vegetation vertical visited visitors walls whole wilderness Window-shopping zone