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Volcanoes In Wisconsin

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Wisconsin has a fascinating geologic history. Geologists believe that about two billion years ago massive volcanoes were centered in what is known as Marathon County. This is referred to the Dells of the Eau Claire. When the lava from these ancient volcanoes hardened into rhyolite-some of the hardest rocks on the planet, millions of years of tectonic sifting tilted a flat rock vertically. Glaciers covered most of the state during the Pleistocene (ice age). The glacial drift contained a variety of jumbled materials, including drift copper, diamonds, flour gold, and most notably, Lake Superior agates. (https://www.mindat.org/loc) The volcanoes were steamrolled by the glaciers as they retreated northward, whittling them down to a smooth rolling

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