4259 (IMAGE) Penn State Caption Insect galls on a fossil leaf from the latest Cretaceous Lefipán Formation (67-66 Ma) in Patagonia, Argentina. Credit Michael Donovan/Penn State Usage Restrictions non commercial use only 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.