August 7, 2013 - Asteroid Impact Killed Dinosaurs: Above, a duckbill dinosaur at the Ulan Bator State Museum in Mongolia. For some 30 years, scientists have debated what sealed the fate of the dinosaurs. Was an asteroid impact more or less solely responsible for the catastrophic mass extinction at the end of the Cretaceous geological period, 65 million years ago? Or were the dinosaurs already undergoing a long-term decline, and the asteroid was merely the coup de grâce?
Posted on: Wed, 07 Aug 2013 07:38:13 +0000