List of impact craters in North America

Columns: Name | Location | Diameter ( km ) | Age ( Ma/millions )
Kentland | Indiana | 13 | < 97 | Manson | Iowa | 35 | 73.8 ± 0.3 | Marquez | Texas | 12.7 | 58 ± 2 | Middlesboro | Kentucky | 6 | < 300 | Newporte | North Dakota | 3.2 | < 500 | Odessa | Texas | 0.168 | < 0.050

Example questions:
Approximately how many years ago was the impact crater created in Tennessee ? | When was the impact crater discovered in Oklahoma ? | What kind of rocks cover the structure of the impact crater that 's in Alaska ? | When was the impact crater found in Indiana discovered ?

Answers:
360 million years ago | 1991 | Permanently frozen Pliocene and Pleistocene rock | 1880