Asteroid strike spurred quick chill that led to dinosaurs’ demise

Ocean temperatures fell 2 degrees after Chicxulub impact

By Ashley Yeager, 15:00 PM May 12, 2014

A space rock slammed into Earth 66 million years ago, setting off a chain of events that led to the demise of the dinosaurs. New evidence supports the idea that the impact caused global cooling in the months to decades afterward that drove mass extinction.

The huge asteroid collided with Earth near what is now Chicxulub, Mexico. Johan Vellekoop of Utrecht University in the Netherlands and colleagues studied lipids from ocean microbes preserved in silt and sand in the Brazos River region of cen...

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