Calvin Impact Crater
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www.unb.ca/passc/ImpactDatabase/images/calvin.htm
From Wikipedia:
Calvin is an impact crater located in Calvin Township, Cass County in the U.S. state of Michigan. It was discovered in 1987 by Randall Milstein of the Michigan Geological Survey while examining data from about 100 test wells drilled in the area.
It is 5 miles (8.5 km) in diameter and the age is estimated to be 450 ± 10 million years (Ediacaran).The crater is not exposed to the surface. It lies about 100 to 400 feet (30–120 m) below today's ground level.
From Wikipedia:
Calvin is an impact crater located in Calvin Township, Cass County in the U.S. state of Michigan. It was discovered in 1987 by Randall Milstein of the Michigan Geological Survey while examining data from about 100 test wells drilled in the area.
It is 5 miles (8.5 km) in diameter and the age is estimated to be 450 ± 10 million years (Ediacaran).The crater is not exposed to the surface. It lies about 100 to 400 feet (30–120 m) below today's ground level.
Wikipedia article: http://en.wikipedia.org/wiki/Calvin_crater
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Coordinates: 41°50'7"N 85°56'59"W
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