DECORAH, Iowa, July 10 (UPI) -- Scientists say air and ground surveys have allowed them to confirm the existence of an ancient impact crater buried beneath a town in Iowa.
Researchers writing in Earth Magazine, published by the American Geosciences Institute, report an airborne geophysical survey and hydrology surveys identified a crater at 3.4 miles wide, almost five times the size of the Barringer Meteor Crater in Arizona.