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Geologic Map
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Generalized Geologic Map of the Conterminous United States
North America Shaded Relief


  The North American Tapestry of Time and Terrain

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Sand Hills

  Close-up of
 the Sand Hills region



Aerial view of the San Hills san dunes
Image available from the NASA Space Shuttle Earth Observations Photography database Photo #STS068-167-00F

The largest field of sand dunes in the western hemisphere is located southeast of the Black Hills region and occupies much of western Nebraska. The Sand Hills, developed on the northernmost occurrence of late Tertiary High Plains deposits, are evident on the map as a fine-scale hummocky texture. The dunes formed as recently as 10,000 years ago during the Pleistocene. Under modest changes in climatic conditions, these dormant features could shed their vegetative cover and again become active, moving across the land.