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June 05, 2006 - 12:35 AM from Giant Crater Found: Tied To Worst Mass Extinction Ever An Apparent Crater As Big As Ohio Has Been Found In Antarctica. Scientists Think It Was Carved By A Space Rock That Caused The Greatest Mass Extinction On Earth, 250 Million Years Ago by Robert Roy Britt http://www.space.com/scienceastronomy/060601_big_crater.html
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