One hour from New York City, where the suburbs of New Jersey give way to farms, a team of scientists are drilling for ancient rocks on the edge of a cornfield. The rocks hold clues about what the earth was like about 201 million years ago,during the great extinction that allowed dinosaurs to dominate. Listen to paleontologist Paul Olsen describe his drilling operation in Stockton, N.J. while colleagues Morgan Schaller, a geochemist at Rutgers University and Dennis Kent, a paleomagnetics expert at Lamont-Doherty Earth Observatory, operate the drill.

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