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Professor Gerta Kellera, a geologist at Princeton University, New Jersey, says fossilised traces of plants and animals dug out of low lying hills at El Penon in north east Mexico show this event happened 300,000 years after the dinosaurs disappeared.
Prof Keller believes instead that volcanoes might have killed the dinosaurs.
"Now we find that another catastrophe, which is Deccan Volcanism, which has not had much attention paid to it, may be the real culprit," she said.