Scientists have uncovered traces of what they think could be the world's largest asteroid impact. The impact might have occurred 450 million years ago, wiping out 85 percent of Earth's species, one said. The structure, the scientists say, could be the remnants of an enormous asteroid impact that hit the Earth hundreds of millions of years ago. If confirmed, it would be the largest asteroid impact on record. The memory of the impact is hidden in the groundOne would think finding the world's largest asteroid impact should be fairly easy.

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Persons: Andrew Glickson, Glickson, Tony Yeates Organizations: Service, Australian Geological Survey Organization, telltale Locations: Australia, Wall, Silicon, Deniliquin, New South Wales, South Africa, Pangea, South America, Africa, Arabia, Madagascar, India, Antarctica