212-Million-Year-Old Leg Bone (IMAGE) U.S. National Science Foundation Caption This is a 212-million-year-old leg bone of a small, uncommon early carnivorous dinosaur encased in rock. Credit Randall Irmis 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.