Lauren Sallan and Professor Michael Coates, University of Chicago Medical Center (image) University of Chicago Medical Center Share Print E-Mail Caption Lauren Sallan and Professor Michael Coates handle a actinopterygian fossil in their Culver Hall lab Oct. 6, 2009. Sallan and Coates found that an extinction event 360 million years ago set the stage for modern vertebrate evolution. The research was published online May 17 by the Proceedings of the National Academy of Sciences. Credit Photo by Jason Smith/University of Chicago Usage Restrictions Attribution Share Print E-Mail 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.