Fossilized Traces of Motility Found in 2.1 Billion Year-Old Rock (image) CNRS Share Print E-Mail Caption Previously, the oldest traces of this kind found dated to approximately 600 million years ago: the Ediacaran period, also characterized by a peak in dioxygen and a proliferation in biodiversity. Scale bar: 1 cm. Credit A. El Albani / IC2MP / CNRS - Université de Poitiers Usage Restrictions None 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.