Lucky me! I saw this stratigraphy and the mists rising off the Oostanaula River within hours of each other.
As far as I know, Wikipee is wrong, and the local pronunciation, derived from the ancients, is something like oooo-sten-ah-lee. Yes, the spelling suggests “lah” on the end, but I hear it’s “lee.” So much for phonetics. (Note some of the alternate spellings.)