The edge of Mars' Jezero Crater experienced at least three water episodes

Perseverance used SuperCam to analyze more than 185 bedrock targets in the Margin Unit and found igneous rock where lake sediments had been expected. Carbon-dioxide-rich groundwater reacted first, ancient lake water likely followed, and a later heated-water event formed calcium sulfate and fluorite. Carbonate and silica can preserve environmental clues, but the findings are not evidence of life.