http://www.cnn.com/2010/TECH/science...ex.html?hpt=T2...evidence now shows that one monster impact caused the ecological catastrophe, Norris said.
Data at the crater's location showed rock with concentrations of iridium and platinum, which are characteristic of the chemical fingerprints of the asteroid, Norris said.
Norris speculates it took about 15 million years before the planet and surviving species started recovering from the impact that also destroyed 70 percent of other species.
"It's believed that the impact actually blew down the forests over most of North America from the pressure wave associated with the explosion," Norris said.
"Then there was this fireball that came after that that fried a lot of vegetation and basically cleaned off the landscape over most of North America."
Scientists say the impact also caused a huge earthquake.
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