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A Field Guide to Finding Fossils on Mars.

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Early Mars may have harbored life. Researchers identified promising geological targets, like clay-rich deposits, for finding fossilized evidence of ancient Martian organisms in future astrobiology missions.

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Area of Science:

  • Astrobiology
  • Planetary Science
  • Paleontology

Background:

  • The Martian surface is currently inhospitable, but past geological evidence suggests warmer, wetter conditions.
  • These past habitable environments on Mars are key targets for the search for extraterrestrial life.
  • National Aeronautics and Space Administration (NASA) and European Space Agency (ESA) missions prioritize searching for biosignatures.

Purpose of the Study:

  • To evaluate potential preservation sites for fossils and isotopic biosignatures on early Mars.
  • To identify the most promising depositional environments and mineralizing media for astropaleontology.
  • To guide future astrobiological missions in their search for signs of ancient Martian life.

Main Methods:

  • Analysis of stratigraphic, mineralogical, and geochemical data from Martian missions.
  • Comparison with Earth's fossil record and studies of organic matter decay.
  • Experimental investigations into organic preservation in simulated Martian conditions.

Main Results:

  • Fe-bearing clay-rich fluvio-lacustrine siliciclastic deposits from the Noachian-Hesperian period are highly promising targets.
  • Silica-enriched deposits within these formations offer excellent potential for fossil preservation.
  • Siliceous sinters are also considered excellent targets, pending confirmation of their presence on Mars.

Conclusions:

  • Noachian-Hesperian clay-rich deposits, particularly those with silica, represent the best-understood astropaleontological targets for current and future missions.
  • Further research is needed to understand fossil preservation in other Martian environments, such as evaporative salts and subsurface minerals.
  • Identifying and characterizing these ancient depositional environments is crucial for the successful detection of past Martian life.