So, did the ocean level drop, or did the land level rise?
I think the earth might have gotten folded and pushed up due to runaway subduction of the continental plates (Google: John Baumgardner Ph.D. geologist for more info).
When I was a teenager, we drove to the west coast across the country. I can't remember exactly where it was, but somewhere near Salt Lake City in Utah, think it may have been west of there, there are mountains that rise above the desert floor.
My father thought he saw a high water marks on those mountains, could have been as much as 70 feet, from ages ago (some would say millenia). So he must have read something because he was looking for it, didn't just happen to notice it. Whatever it was or wasn't, maybe there is another hypothesis for it now.
A higher elevation and regional phenomenon would explain that; it wouldn't necessarily have been related to sea levels.
“So, did the ocean level drop, or did the land level rise?”
Read your Bible. Surely the answer for some folks can be found there.
For me, I will rely on science. I have seem seashells and fossils at Big Horn Canyon in Wyoming/Montana border area.
Must be easily a mile high out there.
Plates have drifted, collided, gone over the tops of other edges.
Alps and Himalyas result from collision of plates. I don’t recall the process which formed the Sierras and Rockies.