[In answer to a question as to why there are no water stains in cave walls if there was a global flood]
It's likely the sea stains were erased just after the Tower of Babel. Sea stains are a form of language and it would have been confounded like everything else.
how are they considered language? well they convey meaning and anything (that is everything) conveys meaning in the universe. So it really does not matter if you do the research or not, if sea stains aren't found it's due to CONFOUNDATION not because they were never there.