For one thing, length and continuity of habitation as others have mentioned, and that comes with call the caches and valuables stashed over a thousand years of conflict.
Additionally, consider litter. You have a busted axe head, your miles from town or anyone whoncan repair it and it’s weighing you down. It’s junk. Toss it way.
After a few centuries that path through a wooded grove gets swallowed up by a modern town, they excavate for a basement and find the remnant of an axe.
Maybe a traveller died in the wilderness off the beaten path, nature reclaims the body, gradually it gets pulled down into the soil, sediment buries it, etc…
When we’ve been living and dying on the same land for a century we leave a mark.
What do you think our landfills are going to look like a thousand years from now?
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