The Anatolians were wrong

The Younger Dryas was the afterclap of the Glacial Maximum in our northern hemisphere from the 10800s BC to 9700 BC. Until a few years ago, Occam's Razor was telling us that this came about through the natural cause of sudden icemelt blocking the North Atlantic Current. But then were found strange readings in soil-samples - foreign material from the sky dropping to Earth. There was talk that Anatolia bore witness to a meteor strike 10900 BC. They had incised reliefs of strange animals considered constellational.

These researchers may still be right that the Anatolians perceived signs in the heavens. But the heavens' failure to deliver sunlight need not be from the heavens.

Solar insolation / irradiance can be shielded from a process on Earth - via volcano. That is now what Nan Sun, Alan D. Brandon, Steven L. Forman, Michael R. Waters, and Kenneth S. Befus found in Hall’s Cave close to home in Texas: Volcanic origin for Younger Dryas geochemical anomalies ca. 12,900 cal B.P..

Sun et al. do find "exotic" minerals [relative to Texas' surface] like osmium - but over 4000 years. The osmium is, further, not of an isotope exotic to Earth at large. Specifically it comes from our own mantle.

To put it plainly the Earth barfed. In Cascadia, Glacier Peak and the famous Saint Helens volcano both went off Bølling/Allerød: 11500ish with 200 year error-bars. Laacher See blew around 11100 BC with a 100 year bar 11130-10970 BC at a 160 year bar. All these are still a bit early. But there are two later ones along the northwestern fringe of the Pacific Rim. If these two went off when Earth's temperature was already tottering...

I wonder if the sharp shift in Earth's crust away from the poles - that is, the icemelt - lightened the pressure covering volcanism at the poles and caused stresses elsewhere.