[TheBlight]

Given the surface of the planet is such a dynamic environment, I wonder how much evidence we should expect even if it did exist.

See also: https://www.scientificamerican.com/article/could-an-industri...

[Rebelgecko]

There's quite a few fossils showing single-celled organisms from 3+ billion years ago. I imagine if more complex life existed the fossils could've survived