I would argue that a tsunami need not cover the entire world as the Bible suggests. I am suggesting that a large asteroid impact would cause flooding on coastal areas. Dramatic and sudden flooding.
This would be something people would remember.
That said, an impact large enough to effect both sides of the Atlantic would have to be large enough to cause serious issues to the planet in other ways. I would suggest, as has been suggested above that flooding is a reasonably common thing and when it happens on a large scale it can be catastrophic (see Indonesia and Thailand).
Add to this the fact that many ur stories involve the world rising out of water (as I mentioned earlier) combined with the idea that water, while destructive is also cleansing.
Tons of symbolism right there. Is it any surprise that story tellers, shamen, holy men, whatever would latch on this in their legends and myths?
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