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

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


  The North American Tapestry of Time and Terrain

The Two maps
Zoom In
Legend and Rock Ages
Rock Types
Political Boundaries

  Legend and Rock Ages

Neogene Rocks - 24 to 1.8 million years ago

map of neogene rocks


The Neogene, bounded by the earlier Paleogene and the modern Quaternary, saw the continued uplift and shaping of the modern Rocky Mountains. It's this relatively recent activity that has given the Rockies their rugged quality, since there has not been enough time for them to be eroded smooth like the Appalachian Valley and Ridge Province.

Other features with Neogene-aged rocks include the Coastal Plain and the Fall Line, the Trans-Mexican Volcanic Belt, Florida, and the Cascades.