The Eocene-Oligocene Transition (IMAGE) Chinese Academy of Sciences Headquarters Caption The Eocene-Oligocene transition (EOT) functioned as a critical filtering episode during the evolutionary history of primates, leading to more lemur like primates in Asia, and driving more anthropods to emerge in Afro-Arabia. Credit Image by Ni Xijun 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.