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Leonardo was wrong about this. It is not due to sea level dropping (except in very isolated cases), it's due to the land rising. Sedimentary rocks that form in sea beds are often uplifted by tectonic processes to form mountains and plateaus. See e.g.


Update Note that this answer was given when this question was on @jamesqf has IMO a better, more informed, more helpful answer below. I don't pretend to know much of anything about geology! Original answer I'd say that Geology is the better venue, but nonetheless here is an answer. Note that there are lots of reasons why elevation ...

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