Old things are often found buried underground, even whole cities. Where does this "new" ground come from?

by captain_hector
Searocksandtrees

hi! not discouraging additional responses, but check out some previous responses here

It may be worth x-posting this to a sub with more archaeologists & anthropologists (e.g. /r/AskAnthropology, /r/AskScience, maybe /r/Archaeology) for more examples.