Calvin crater
Coordinates: 41 ° 50 ′ 0 ″ N , 85 ° 57 ′ 0 ″ W.
The Calvin crater is an impact crater in the field of Calvin Township in Cass County in the US state of Michigan .
The crater cannot be seen on the surface of the earth. He is about 30 to 120 meters below. Its diameter is 8.5 kilometers. The crater was discovered in 1987 by Randall Milstein of the Michigan Geological Survey while evaluating data from 100 test holes.
The age is estimated at 440 to 460 million years, so the Upper Ordovician .
See also
Individual evidence
- ↑ a b Craters are evidence of ancient meteorite strikes . The University Record. September 12, 1994. Retrieved May 26, 2006.
- ↑ a b Calvin . In: Earth Impact Database . Archived from the original on March 3, 2016. Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved September 13, 2013.
