[Flag_This]

"You would think the Ice Age would have been such a big deal it was remembered in some myth."

The glacial periods can last thousands and thousands of years - for people from those times, it's all they would have known.

[Trumpinator]

Then why was it not transmitted forward as a myth? Maybe it exists in some myth I have never read about. The Greeks have a story of a hyperborea and that is about as close as one can match to something that resembles an ice age. Plenty of stories of a "thaw" like event like the end of the ice caps would have produced aka a world spanning flood.

The theory of course is that the coastal people were the advanced ones and those inland pretty much primitives. The end comes and wipes out the coastal civilization that rose up and all that survive are a few refugees from the coast and the move in with the primitives and the primitives memorialize this in our mythology of their ancestors meeting gods or heroes. When put that way it's a plausible scenario.