Massive quakes, asteroid impact (perhaps even one with water in it), volcanic activity, etc

Are there any pre Neolithic myths? At any rate the closer you get to the beginning of those myths being told I think the closer you get to some kind of unique event in the history of the human species

something that would result in ancient civilizations like Harappa where there is strong evidence of an atomic explosion

http://veda.wikidot.com/ancient-city-found-in-india-irradiated-from-atomic-blast

Idk it's wild