Brachiopod and crinoid fossils (IMAGE) Stanford University Caption Brachiopod and crinoid fossils from the Late Ordovician, about 445 million years ago. Credit Seth Finnegan Usage Restrictions Credit required 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.