Antarctica was flash frozen - there are pyramids underneath the ice, just now being found.
Flash freezing can be caused by a sudden pole shift, and rapid melting of the glaciers of ice ages also happens with pole shifts. Imagine that a warm temperate climate in Antarctica was suddenly transformed into sub-zero temperatures due to a pole shift.
We may be having at present, somewhat of a gradual thaw of glaciers, and Ice buildup, and then as tension builds, a sudden pole shift. Geological records indicate pole reversals. By inspection of the line-up of molecules in minerals, past pole shifts can be revealed. The line-up changes according to where the compass points during a warming of the mineral. When it cools and solidifies, the line-up is permanent. Until the next pole shift!