Michelle F Wrote:
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> Good question. If it were advanced... probably no
> way to prove it. My life is mostly digital
> nowadays - my photos, my books, my research are
> all online or on my computer. How long would that
> last? Heck, I can't even access my docs on old
> floppies now! Certainly unlikely anything of me
> will exist after a hundred years. Now add
> millions. We could have had entire civilisations
> come and go and be none the wiser!
>
> only thing that truly endures is stone and even
> that has its limits.
>

Well cut gems and gold items would survive, ceramics, glass, radioactives, stone tools and other items. In sedimentary soils that were not eroded away or subducted they would contain trace elements of the pollution created by the civilization. Resources would have been mined or quarried, or 'tubed' for, any disturbance of the soil would remain. So if they were large enough (area wise) and messy enough (as are the human civilizations) we might detect them even tens or hundreds of millions of years later.
>
> Cool. My first Maat reply in over a decade. I
> wonder how much of old me exists here? ha!
> Probably nothing.