Have a read of the Book of Enoch. The dimensions almost always are mangled in the long time these stories lived only as oral stories, no matter how fastidious the culture was about retaining their correctness. Humans mostly live around 100 years, at best. The other point is that the volcanoes in the Atlantic, such as this one on Madeira and the ones on the Canaries and so on... aren't that old. Not old enough that weathering could so completely erode them down like we see with Richat. You really need to see real life young volcanic land to understand just how much older a place that had its geometry defined by an ancient volcano must be than anything in the atlantic. The entire ocean of this planet is only 200 million years old, or so. The land is much older. There MUST have been a time when this planet was land with only rivers and lakes breaking up the monotony of the variously aged stone of fresh and very old volcanic crystallization. I'm fascinated that so many y'all are getting into this stuff now. My intuition is that this is all very very relevant and that what caused the Great Flood is about to return.