Salt Crust Sample (IMAGE) University of Washington Caption Sebastian Haas holds a piece of the salt crust from Last Chance Lake with green algae in the middle and black sediment at the bottom. Credit David Catling/University of Washington Usage Restrictions With credit 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.