<I>Yizhousaurus</I> (IMAGE) Geological Society of America Caption Scientists have discovered in China the first complete skeleton of a pivotal ancestor of Earth's largest land animals -- the sauropod dinosaurs. This photo shows the skull and lower jaw of Yizhousaurus, an early sauropod dinosaur from the Lower Jurassic (~200-million-years-old) of southern China. Credit Bill Mueller Usage Restrictions Educational / non-commercial 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.