Lagoon aerial view (IMAGE) University of Colorado at Boulder Caption Green mounds of stromatolites flourish at the bottom of a lagoon in Argentina's Puna de Atacama. Credit Brian Hynek Usage Restrictions Use with credit only 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.