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Mars is big, fossils are small.

• ceejayoz 3y ago
  There are areas on earth where fossils are abundantly available at the surface. If there was macroscopic life on Mars at some point, there's likely to be some rocky outcrops with them. Layered sedimentary rocks like the ones pictured in https://www.kqed.org/science/24828/nasas-curiosity-rover-finds-evidence-of-possible-long-term-water-on-mars https://www.kqed.org/science/24828/nasas-curiosity-rover-fin... are probably good candiates.
  • XorNot 3y ago
    The trouble is that while common, we still had to explore our whole planet pretty thoroughly to find them. We just don't enough machines exploring Mars to do it right now.
    • ceejayoz 3y ago
      That's fair. I'd expect knowing where we're likely to find them on Earth does at least help inform our few Mars landers' choice of landing sites, though.
    • chatmasta 3y ago
      Would orbiting satellites with lidar sensors be able to find suitable candidate sites for digging?