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Let's put the Kerguelen Plateau above sea level. -
http://en.wikipedia.org/wiki/Kerguelen_Plateau
It's a smallish continent. Not big enough to mess up the climate or human development - history proceeds according to plan.
Some dinosaurs, mammal-like reptiles, giant temnospondyl amphibians, etc. survive on it.
Humans haven't reached it until the Age of Exploration.
What then?