Tinguiririca River Valley (image) American Museum of Natural History Share Print E-Mail Caption This photo is of the Tinguiririca River valley in the Andes Mountains of Chile, where the research team discovered the newly named rodent fossils. Credit D.A. Croft/Case Western Reserve University Usage Restrictions Credit required 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.