[hh3k0]

Such as?

[TheHumanist]

That's a frustrating response, because you must surely understand as a whole what they are saying.

Artifacts that would have been used by these civilizations, whatever those may have been.

[Johnny555]

Its a reasonable question - what human made artifacts would survive for hundreds of millions of years? Would concrete and steel buildings still be intact after hundreds of millions of years of erosion and weathering? Would objects in a 5 story deep basement be intact? Would even something we placed on the moon be visible after a 500 million years of micrometeorite impacts?

[alexey-salmin]

Which exact artifacts do you have in mind that won't desintegrate in a few hundred million years? Pyramids won't last even one million and they're not among the most fragile products of human civilization.

You may have confused geology with archeology, they operate on completely different time scales.

[hh3k0]

> That's a frustrating response, because you must surely understand as a whole what they are saying.

It's late and I couldn't come up with something that'd survive the timespan in question, so I just wanted an example.