[dharmab]

Over geologic timescales, almost all rocks on earth are pushed down far enough that they melt, mix, and are churned back up as new rock.

[jl6]

There’s still a lot of room to hide in that “almost”. Continental shields in Canada and Australia haven’t been recycled into the deep Earth and we can still find geological features there that are billions of years old.

[Jensson]

We still find fossils from hundreds of millions of years ago, and giant constructions are much better at surviving than skeletons.

[hef19898]

Only that so far back, we know Earth was not really inhabitable.