So over in GQ, we’re on a bit of a tangent about ancient lost civilizations. We’re talking LOST over millions of years. Civilizations of the non-human variety. I’m positing that we’d know because of things that last a long time.
I’ve also gotten interested in things we’ve done that would show up in millions of years when the damn raccoons or something have evolved into an industrial civilization.
So put yourself in their little, bemasked feet, my friends. Imagine you’re looking for evidence of a non-raccoon civilization from 10+ million years ago. Would it be self-evident a la the predecessor civilization in Niven and Pournelle’s Footfall? Or would they have to look for specifics? Or would it be impossible?
What things we’ve done, right now, would be a sign for them? I argue in the thread that large quarries would last a very long time and be fairly obviously non-natural events. But there must be others.