Papa Lazarou
Living in a De Zerbi wonderland
There was a documentary on C4 (I think it was called Life After People) some years ago that asked the question about how long evidence of our current civilization would be detectable. As I recall, I think the last traces would be things along the lines of Mount Rushmore. What was surprising would be how quickly things would get buried and decay. Most cities would be unrecognizable in just 1000 years, just a few piles of rubble buried in jungle.
I think our age will at least be recognisable in the geological record by the plastics, pollution and particularly radiation we've added to the environment. These will be recorded in new rock laid down.