Dickinsonia Fossil (IMAGE) University of California - Riverside Caption Researchers at UC Riverside are studying the world's oldest fossil animal, Dickinsonia, to learn more about the evolutionary history of animals. Credit University of California, Riverside 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.