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Geology
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Shaded Relief
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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
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Features
Legend and Rock Ages
Rock Types
Political Boundaries
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  Features
 

Driftless Area

 

Close-up of
 the driftless area in central Wisconsin Isolated patches of rough terrain in the unglaciated Driftless Area, primarily in southwestern Wisconsin, stand out from the surrounding, smoothed glaciated ground. Thoroughly dissected by tributaries of the Mississippi River, the topography within these "islands" was engulfed but never overridden by the ice. The appearance of the Driftless Area landscape today probably is much like that of adjacent glaciated landscapes prior to the first Pleistocene ice advance.