Graphs (IMAGE) University of Bristol Caption Graphs showing how speciation rate (blue) dipped and extinction rate (red) rose sharply in the last 10 million years of the age of dinosaurs. Run together, this corresponds to a rapid reduction in the number of species (black) just before the impact of the asteroid 66 million years ago. Credit Fabien L. Condamine Usage Restrictions Single use only - with press release License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.