Earth's Recent Geological Time Scale (IMAGE) University of Wisconsin - Milwaukee Caption The time scale shows the expanse of time between the Permian-Triassic mass extinction and the less severe mass extinction that wiped out the dinosaurs. Credit Nan Fitzpatrick, UW-Milwaukee Usage Restrictions with graphic credit 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.