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New research details first days after asteroid strike that killed off dinosaurs


September 19, 2019
Matt Carroll

UNIVERSITY PARK, Pa. — A giant, speeding asteroid crashed into a shallow sea 66 million years ago and plunged Earth into a mass extinction that claimed 75 percent of all species, including the dinosaurs, scientists have long believed.

Researchers have found new evidence that supports the theory and paints the clearest picture yet of the Cretaceous-Paleogene extinction event. Core samples taken from ground zero, the Chicxulub crater in the modern-day Gulf of Mexico, reveal what happened in the days after the massive asteroid impact, according to a recent study published in the Proceedings of the National Academy of Sciences.

“As geologists, the things we study usually take place over thousands or millions of years,” said Timothy Bralower,
professor of geosciences at Penn State and a co-author on the new study. “Here we are seeing incredible changes that took place over months, including the extinction of about 75 percent of lifeforms on our planet.” More 

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