News of the WeekEvolution

Did an Asteroid Shower Kick-Start the Great Diversification?

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Science  21 Dec 2007:
Vol. 318, Issue 5858, pp. 1854
DOI: 10.1126/science.318.5858.1854

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Summary

This week, a team of geologists and paleontologists reports that a collision in the asteroid belt showered Earth with debris just when the Ordovician diversification was getting started, suggesting a cause-and-effect connection.