Yeah, no one ignores anything. This sounds like a different local disasters. Over that wide of a time frame it sounds pretty normal.
How is it local when they are litterally found everywhere in the world? Something global destroyed them all. And yes, it is widely ignored.
I am assuming you are talking about the biblical flood? You are using their lines. So he issue is the flood of the bible lasted 40 days, and these events spread thousands of years.
