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**Summary:**

The Perseverance rover has been exploring the Bright Angel formation within Jezero Crater’s Neretva Vallis on Mars. Analysis of mudstone and conglomerate outcrops reveals the presence of organic carbon and iron-phosphate/iron-sulfide minerals (vivianite and greigite). These minerals appear to have formed through post-depositional redox reactions involving the organic carbon in a low temperature geological environment. This is potentially due to microbial activity. The geochemical context, mineralogy, and organic signatures suggest the Bright Angel formation is a potential biosignature, requiring further Earth-based laboratory analysis of collected core samples to determine the origin of these materials and textures.

**News Article:**

**Perseverance Rover Finds Organic Carbon and Minerals Hinting at Past Life in Martian Mudstones**

**Jezero Crater, Mars** – NASA’s Perseverance rover has made a tantalizing discovery within Jezero Crater: organic carbon alongside iron-phosphate and iron-sulfide minerals within mudstone formations in Neretva Vallis. The findings, detailed in a recent publication in *Nature*, suggest a potentially habitable environment in Mars’ distant past.

The Bright Angel formation, the focus of the rover’s investigation, reveals mudstones containing nodules and reaction fronts enriched in the minerals vivianite and greigite. Scientists believe that these features were formed by redox reactions occurring after the mudstones were deposited. What’s particularly intriguing is the presence of organic carbon participating in these reactions.

“The textures, chemical and mineral characteristics, and organic signatures found in the Bright Angel formation warrant consideration as ‘potential biosignatures’,” according to the *Nature* paper. However, the team notes that non-biological processes could also account for the observations.

To unravel the true origin of the observed minerals, organics, and textures, researchers plan to conduct more research and careful Earth-based lab analysis to understand whether life had ever flourished within Jezero Crater.

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