@KeillerDon I looked at the 700 million year ago Snowball Earth theory about 15 years ago and it seemed very sketchy to me. Some Canadian geologists (who are very experienced in glacial geology) argued that formations more likely to be flood related than glacier related.
@KeillerDon 2/ a key proponent of Snowball Earth theory was Mann's friend, Richard Alley. I didn't try to parse relative merits of two theories, but, if I had to choose, would pick the Canadian geologists. If geological formations can be explained without glaciers,
@KeillerDon 3/ then physics problem of trying to explain entry into and exit from Proterozoic Snowball Earth become moot.
@KeillerDon 4/ in this perspective, the Pleistocene is end result of very profound and continuing cooling of the entire planet since the Eocene, gradually becoming more and more intense due to CO2 starvation with most recent Ice Age being a more or less uniquely intense cold phenomenon.
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