Ancient Soil Nodules (image) Southern Methodist University Caption Jurassic soil nodules from 150 million years ago, such as these from Portugal, shed light on ancient ecosystems and the relationship between climate, vegetation and animal diversity. Paleontologist Scott Myers explains the research in a video at: http://bit.ly/UROD8e. Credit Image: Timothy S. Myers Usage Restrictions Please credit 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.