Fossil feather (IMAGE) University College Cork Caption Isolated fossil feather from the Green River Formation (ca. 50 million years old, USA). Specimen held in the Yale University Peabody Museum of Natural History. Scale bar indicates 100 mm Credit Dr Tiffany Slater Usage Restrictions None License Original 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.