It is strange that anthropologists do not take into account the huge floods and the huge changes that made to where humans lived and how they lived. Especially when just about every ancient text talks about the great floods. (like the flood of Noah in the Bible)

And then anthropologists believe that we are the greatest advanced civilization on earth, even though there are many signs and things found that point to some group that were doing things we don't know how to do today.

We are the 5th global advanced civilization on this planet.
We would start to see this if we pulled our heads out of our asses and stopped that mind-worm of "we are the pinnacle"

We are like the 13th advanced civilization... or some such

But instead of working these things out, we actually have signs that a group of people have destroyed them. Lots of stuff sent to the Smithsonian... that no longer exist.

On top of that, we are entering an ice-age and we really do not have good records of what that will do to the coastline.