[Narkeere]

I think the main difference between the OP and the picture presented in Geoff D's links is that most people think that the 'snowball Earth' (if it happened) retained an area of unfrozen/partially frozen water around the equator, even though there was land glaciation at those latitudes ie it was a 'slushball Earth' rather than a full snowball. There are some people who argue for a hard snowball though (and then there are quite a few people who argue it never happened like that at all).

this goes to Geoff's other point - while these subjects are all very definitely ideas that are widely canvassed, I don't think there is anyone who claims them as absolute facts. Even the strongest supporters of the snowball Earth theory (like Hoffman) cheerfully admit that there are still main unknowns and problems.

See, the following quote from this review article on the period:

This list of papers in support of or opposition to the snowball Earth hypothesis is too long to review in full in
this chapter.