Quote:
Originally Posted by supernova1965
Global warming causes the ice at the poles to melt and the fresh water stops the ocean conveyor belt circulating warm and cold water which causes the iceage because the warm water is not moved to the northern hemisphere something like that anyway I haven't explained it well but that is the general idea.
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Nope.
That only works for the present. The continents were in different positions then, to what they are now. Many of them were around the south polar region of the planet, but that doesn't explain why the ice age was there. Given the high CO2 conc' and the prevalence of a world spanning ocean at the time, the temps should've been much higher, all things given. Ocean circulation patterns, wind patterns etc, were completely different to now.
Go
here and have a look at the position of the continents during the Ordovician and Silurian Periods.