No. 72: Nov-Dec 1990
"With the help of magnetic sensors, scientists have detected a rimmed circular structure, 30 miles in diameter, more than a mile beneath the floor of Lake Huron. They believe the magnetic ring marks a buried crater -- blasted by a meteorite at least 500 million years ago."
(Stolzenburg, W.; "Impact Crater May Lie beneath Lake Huron," Science News, 138:133, 1990.)
Reference. Many other impact craters are cataloged in section ESC in our catalog: Carolina Bays, Mima Mounds. Details on this book here.