Identifying impact craters thumb|Impact structure of craters: simple and complex craters thumb|Wells Creek crater in Tennessee, United States: a close-up of shatter cones developed in fine grained dolomite thumbnail|Decorah crater: aerial electromagnetic resistivity map (USGS) thumb|Meteor Crater in the U.S. state of Arizona, was the world's first confirmed impact crater. thumb|Shoemaker Crater in Western Australia was renamed in memory of Gene Shoemaker.
Identifying impact craters thumb|Impact structure of craters simple and complex craters thumb|Wells Creek crater in Tennessee, United States: a close-up of shatter cones developed in fine grained dolomite thumbnail|Decorah crater: aerial electromagnetic resistivity map (USGS) thumb|Meteor Crater in the U.S. state of Arizona, was the world's first confirmed impact crater. thumb|Shoemaker Crater in Western Australia was renamed in memory of Gene Shoemaker.