How old is the Driftless Area?

The sedimentary rocks of the Driftless Area are from the Paleozoic Era and up to 545 million years old, and even the most recent strata of bedrock are hundreds of millions of years old. Since the glaciers of the last Ice Age, which started between one and two million years ago and ended roughly 13,000 years ago, did not extend into the Driftless Area, the rivers of this landscape have been left to carve the rugged topography for many millions of years. As a result, some geologists believe that the Kickapoo River may be the oldest active river in the whole world.

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