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What was the Oligocene period related to?

Antarctica - 40 million years ago, the fossil record shows that the continent experienced what conditions?

Descent of Antarctica into a permanent icehouse state occurred rapidly when?

Antarctica's transition to icehouse conditions due to (1):

Antarctica's transition to icehouse conditions due to (2):

Antarctica's transition to icehouse conditions due to (3):

External forcings

What do the external forcings control?

Internal forcings

Milankovitch Cycles - Argument