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The drawing made by the Anasazi Indian people who inhabited what is now the Natural Bridges National Monument in western United States. This quite well preserved and astonishing depiction of what is obviously a sauropod dinosaur was made a mere 400 years ago, just as the Europeans were beginning to explore the North American Continent. It is quite obvious to the casual observer that the Native American who drew this picture did so from an actual living animal in order to have depicted the creature with such stunning accuracy.
