[Lucius Cornelius Sulla]

So now we have three sizes of ice ages?

There are Little Ice Ages, like those of the Dark Age and the late Medieval period, which bring great illnesses and crop failures. There are mini Ice Ages, like the Later Dryas, which cause cataclysmic regional population collapses. Lastly full scale Ice Ages, which bring cataclysmic climate change on a global level.

Has much been done to quantify these distinctions?

[SunkenCiv]

There have been lots of glaciation events, all of them, literally, unexplained — apart from the usual resort to unworkable gradualist schemes by true believers. So it’s safe to say that there have been far more than three. :’)

[null and void]

Has much been done to quantify these distinctions?

How tall is a mountain? Serious question...