Late Cenozoic ice-cap glaciation and its many geomorphic effects mark a chapter in U.S. Earth history that began some 2.0 million years ago and ended about 10,000 years ago. A subtle but widespread feature remarkable for its exposure on this composite image is the overall textural contrast created by the last of the several ice-sheet advances from Canada. Particularly in the mid-continent, topography north of the highly irregular line marking the glacial limit is muted and smooth and lacks the strong river-carved grain characteristic of unglaciated terrain to the south.
Take a look at these features that show the effects of glaciation!
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