The Nothofagus Pumilio Forest (IMAGE) Proceedings of the National Academy of Sciences Caption The Nothofagus pumilio forest in the valley of Río Frías, in northern Patagonia, Argentina. This tree species was instrumental in contributing 85 tree-ring chronologies to the development of the Drought Atlas.��� Credit Image credit: Ricardo Villalba Usage Restrictions None 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.