Jezero (IMAGE) Brown University Caption A false-color image of Jezero crater shows the edge of an ancient river delta, where researchers have spied hydrated silica, a mineral that's especially good at preserving microfossils and other signs of past life. Credit NASA 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.