Large Prehistoric Underground Circle Found in Chillicothe, Ohio
90-foot-diameter circle discovered entirely underground by magnetic sensing equipment at Chillicothe prehistoric Mound City Group National Monument about 40 miles south of Columbus, Ohio. Large earthworks of ditches, walls and mounds in circles, octagons, squares and rectangles were created by cultures that lived in the Ohio region. First known were the Adena (1000 B.C. to 200 A.D.) followed by the Hopewell (500 B. C. to 500 A.D.) The Adena and Hopewell did not leave any writings, so no one understands precisely why the large soil formations were created.
October 5, 2001 Chillicothe, Ohio - About 3,000 years ago, a culture that archaeologists call the "Adena" made great soil formations in Ohio and the greater Mississippi Valley. By 500 B. C., the Adena evolved into a subsequent culture that archaeologists call the "Hopewell" after an 18th Century farmer named Hopewell who owned the land near Chillicothe, Ohio upon which many mounds are concentrated. The ancient patterns include circles, octagons, squares and rectangles. When the Adena dug great round ditches and piled walls of soil along the edges, one of their favorite measurements for circles was a 90-foot-diameter. No one knows why.
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