Leaf Mining (IMAGE) Penn State Caption View of the Palacio de los Loros 2 fossil plant locality in Chubut, Patagonia, Argentina. The locality was deposited in the early Paleocene around 64 million years ago. Credit Peter Wilf, 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.