to the National Atlas Home page
About | Fact Sheets | Contact Us | Partners | Products | Site Map | FAQ | Help | Follow us on Twitter 
Part of Project LogoAgricultureBiologyBoundariesClimateEnvironmentGeologyGovernmentHistoryMappingPeopleTransportationWater
to the Interactive Map MakerMap LayersPrintable MapsWall MapsDynamic MapsArticlesMapping Professionals





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

Article

  The North American Tapestry of Time and Terrain

Introduction
The Two Maps
Zoom In
Features
Legend and Rock Ages
Rock Types
Political Boundaries
Credits

  Features
 

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.