Where would be an ideal location to place a "time capsule" that would survive on geological timescales?
I recently watched a PBS Spacetime episode that talked about the idea that evidence of a technological civilization like our own could essentially be erased (aside from chemical/atmospheric signatures in sedimentary rock layers) in a relatively short time, geologically speaking. Where on our planet could we place some evidence of our existence and intelligence that would remain unharmed for potentially hundreds of millions of years? I'm thinking an area far from subduction zones, and an area that would retain an arid climate maybe? It seems unlikely that we can accurately predict tectonic motion and climatic changes that far into the future... but if you had to make a guess for what part of a continental crust would make for long term stability, where would it be?