Crinoid Fossils (IMAGE) Ohio State University Caption Fossils of sea creatures known as crinoids, which lived 350 million years ago. Credit Photo by Kevin Fitzsimons, courtesy of Ohio State University. Usage Restrictions News Media only 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.