Iron-Rich Rocks of Death Valley (IMAGE) Proceedings of the National Academy of Sciences Caption The iron-rich rocks of Death Valley (California) provide a window into the Earth's most severe ice age. Credit Image courtesy of Maxwell A. Lechte. 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.