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Texas Asteroid Impact

The site known as the Marquez Dome, 60 miles from Waco, TX, is actually the remnants of a huge crater formed during an asteroid impact 58 million years ago, scientists now say.Previously thought to be a salt dome, the crater filled in with rock over geologic time.
During the intial impact, the asteroid left a crater some 8 miles wide. The incident may well have had global consequences as "the amount of energy released was around 10 million to 100 million megatons," said Bill Deane, a University of Tenn. geology professor. Read more here(1).

1. http://www.wacotrib.com/news/newsfd/auto/feed/news/2004/06/20/1087708209.02632.5749.8278.html

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