Thanks! Interesting to hear what kind of evidence we have that points toward droughts and volcanic eruptions.
Note that overall I’m very uncertain how much to discount the Hekla eruption as a key cause based on the uncertain dating. This is literally just based on one sentence in a Wikipedia article, and I didn’t consult any of the references. It certainly seems conceivable to me that we could have sufficiently many and strong other sources of evidence that point to a volcanic eruption that we overall should have very high credence that the eruption of Hekla or another volcano was a crucial cause.
Guys, great post and discussion. I was taking a look at the discussion about Hekla’s role… even if the eruption succeeded the breakdown of those civilizations by half a century, it’d likely have an effect concerning their prospects for recovery.