A quick recovery after dinosaur deaths

By Sid Perkins, 15:48 PM April 15, 2008

Evidence from 65-million-year-old sediments suggests that a single impact from space wiped out the dinosaurs and that ecosystems recovered from the trauma in only a few thousand years.

Researchers analyzed layers of ocean sediments deposited during a 1.5-million-year period in Italy and Tunisia. Among these was the thin clay layer that marks when the dinosaurs became extinct. The scientists found that the concentrations of the isotope helium-3 in the sediments didn't vary during those 1.5 mil...

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