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| | Crater - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-29) |
 | | A number of researchers, most notably Eugene M. Shoemaker, conducted detailed studies of the craters that provided clear evidence that they had been created by impacts, identifying the shock-metamorphic effects uniquely associated with impacts, of which the most familiar is Shocked quartz. |
 | | Armed with the knowledge of shock-metamorphic features, Carlyle S. Beals and colleagues at the Dominion Observatory, (Victoria, British Columbia, Canada), and Wolf von Engelhardt of the University of Tübingen in Germany began a methodical search for "impact structures". |
 | | Some volcanic features can resemble impact craters, and brecciated rocks are associated with other geological formations besides impact craters. |
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