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
 

Rio Grande Rift

  map of Rio Grande RiftThe mid-section of the continent is being pulled apart by extensional forces. Volcanism accompanies this activity. The upper Rio Grande River flows southward through New Mexico within a long fault-bounded basin, the Rio Grande Rift, where lava from a source deep in the mantle periodically spreads across the surface. In the near geologic future, several million years or so, a youthful ocean basin may occupy this area.