Calvin crater

41.833331 - 85.949995Koordinaten: 41 ° 50 '0 "N, 85 ° 57 ' 0 " W

The Calvin Crater is an impact crater in the field of Calvin Township, Cass County in the U.S. state of Michigan.

The crater in 1987 by Randall Milstein from the Michigan Geological Survey in the evaluation of data was discovered more than 100 test holes

Its diameter is 8.5 kilometers and the estimated age of 440-460 million years. From the surface of the crater can not be seen. It is located about 30 to 120 meters below.