Originally Posted by BadNick

I'm not sure you directed that to my post mentioning 3.5 billion years but I'll elaborate anyway. My point was not that particular billions of years old global flood, but that an ancient humanoid might have had enough intelligence to see clues of previous ancient floods and those ideas led them to imagining how it happened, fear of the consequences if it happened again, and myths arising from those ideas. Plus, besides that "global" flood that may have occured billions of years ago, there were surely many other more recent impact related tsunamis that left dramatic evidence of floods. The NG article mentioned and showed some evidence of the formations on land left behind, and also evidence of the impact sites that created those features.