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Calvin crater : ウィキペディア英語版 | Calvin crater 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 (Ordovician). The crater is not exposed to the surface. It lies about 100 to 400 feet (30–120 m) below today's ground level.〔 ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Calvin crater」の詳細全文を読む
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