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Ruby Falls - Chattanooga, Tennessee
Ruby Falls is a 145-foot high underground waterfall located within Lookout Mountain, near Chattanooga, Tennessee. The cave which houses Ruby Falls was formed with the formation of Lookout
Mountain. About 200 to 240 million years ago (in the Carboniferous Period, at the end of the Paleozoic Era) the eastern Tennessee area was covered with a shallow sea, the sediments of which eventually formed limestone rock. The Falls are located at the end of the main passage of Ruby Falls Cave, in a large vertical shaft. The stream, 1120 feet underground, is fed both by rainwater and natural springs. It collects in a pool in the cave floor and then continues through the mountain until finally joining the Tennessee River at the base of Lookout Mountain.