You may also learn about geological components of the Great Sand Dunes system, hydrology of Great Sand Dunes, and the variety of dune types in the park. The 2016 Geologic Map of the Great Sand Dunes National Park (USGS/Madole, VanSistine, Romig) includes text describing some of the most recent research information. 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. The story of how the Great Sand Dunes were formed is continually evolving, as new research discoveries occur each year. The full story of their formation is still being discovered. The tallest dunes in North America make a dramatic contrast with the alpine peaks of the Sangre de Cristo Mountains.
