I thought it was a volcano did them in?.....................
Nah. And the alleged calibration of the RC dating, via dendrochronology, pushed the alleged eruption back almost a century, which means the supposedly super-duper eruption happened nearly two centuries before the Palatial period ended -- hard to explain if the eruption was so danged devastating. You should see some of the gymnastics people engage in to try to bail it out, even without the calibration. In fact, stick around this topic, you'll probably see some.