Ancient plant microfossils (IMAGE) Proceedings of the National Academy of Sciences Caption Ancient plant microfossils called phytoliths from northeastern Peru. Credit Image credit: Dolores R. Piperno. 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.