Phytolith Fossil (IMAGE) University of Washington Caption This is a 49 million-year-old epidermal phytolith from a fossil soil horizon of the Las Flores Formation. Its curvy and large shape indicate the plant it came from grew in shady conditions. Scale bar = 10 micrometers. Credit Regan Dunn, U of Washington Usage Restrictions Photo credit required. 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.