The tallest dunes in North America make a dramatic contrast with the alpine peaks of the Sangre de Cristo Mountains. The full story of their formation is still being discovered. NPS/Patrick Myers. The story of how the Great Sand Dunes were formed is continually evolving, as new research discoveries occur each year. Below is a basic summary of what most geologists currently understand to be the broad series of events that took place in the formation of these massive dunes.
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