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Off-road enthusiasts enjoy riding on old mine tailings at St. Joe State Park. This park is on the list of potential superfund cleanup sites.  It is the largest and highest use park in Missouri.  Workers are tested for heavy metals every 3 months. Once an ancient sea, its uplifted floor untouched by scouring glaciers that stopped to the north.  Eons of erosion carved deep valleys into the Ozarks crusty limestone plateau, transforming its flat surface into the unlikely role of hills.  They march nearly level into the distance, and peak at 2,600 feet in Arkansas's Boston Mountains...  Ozarks region in Missouri and Arkansas by Randy Olson for National Geographic Magazine.
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