The process of fossilization makes this an impossible conclusion. To put it simply, if something dies on the surface of a planet it's not going to get
fossilized; it would have to die and be buried shortly after.
That's what happens when you leave you spacecraft without a suite, no free oxygen, air pressure just about enough to be able to detect it, (0.015% of
Earth's) Ultra violet strong enough to fry anything living.
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