Pretty sure the stuff from 12,000-13,000 yo was a cometary bombardment epoch at the end/near the end of the last ice-age, not a polar shift.Unless the sun happens to bitch-slap us during this time, which it might, hence the bunkers. Honestly, this is probably why those tunnels in Turkey they found were built. A lot of things coincide to the last polar shift about 12,000 - 13,000 years ago. I hope I'm wrong, but, man, things look bad. And in the meantime we're fighting commies.
You had meteor fragments whacking the Earth every few years as the progenitor of the Tauriod meteor stream broke up and established the debris's current orbit. Woudl have cause Chelyabinsk/Tunguska level air-burst and impact winters when things actually made it through.
I think analysis of things like Gobekli Tepe and such keep missing an obvious possibility; the pits and large stone pillars may have held up the roof to what was a primitive fallout/air-burst debris shelters.