The rocky bluffs of the Wisconsin Dells are among the oldest exposed bedrock on earth, forming more than 500 million years ago, early in the Cambrian period. This particular kind of sandstone is also found in Potsdam, Germany and Potsdam, New York as well as in Zurich, Switzerland. The cliffs are remnants of ancient sand dunes, part of a desert that once covered the entire continent.
Photo captured August 7, 2015.
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