Question for the floor

[andrewducker]

So, how long in the past would a previous civilisation of, say, Mesopotamian levels have had to be for their to be no remaining sign of it? i.e. for any bronze tools to corrode away to nothing, pottery to do likewise.

How long will it take until Stonehenge is worn down to nothing by the wind and rain?

Comments

[pennski.livejournal.com]

What a fascinating question and set of answers. I'm going to be thinking of dinosaur rappers with a space program now.

[andrewducker]

Yeah, I got some fascinating thoughts there!