Laguna de Huanco (IMAGE) Penn State Caption Laguna del Hunco, shown here, and other fossil sites in Patagonia, Argentina preserve hundreds of plant species that lived on the Gondwanan supercontinent. Many of these fossils are considerably older than their corresponding molecular-clock estimates. Credit Peter Wilf 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.