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The article was orginally published at: Undisturbed, Prehistoric Sand Dune Discovered at Michigan State University

Photo: Courtesy MSU.
The sprawling campus of Michigan State University takes in 5,200 acres. There are trees that shade the landscape and a Grand River that runs through it. Researchers have just found a 16,000- to 20,000-year-old sand dune on the campus, too, beneath a grove of pine trees….Read the full story on TreeHugger
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