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I think that even our current civilization, if it stopped today, would be pretty easy to miss in the geological record 200 million years from now.

But imagine if civilization had ended 500 years ago, or even a thousand. There would be absolutely nothing to show for it in a couple hundred million years time.

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> But imagine if civilization had ended 500 years ago, or even a thousand. There would be absolutely nothing to show for it in a couple hundred million years time.

I think some stone artifacts (cities, pyramids, roads) would still be identifiable in some cases. Excavation would be needed, of course.

Similarly, some of our concrete, glass and non-ferrous metal construction should survive a long, long time.

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