According to conventional thought, the last time Antarctica’s coastal regions were ice free was 14 million years ago, as I recall.
14 million years, huh?
Dang, you've got a long memory ;-)
Aren’t there some Columbus era maps that show a shoreline for parts of Antarctica. These maps if they exist could be a lot older, or copies of much older items. Remember that so much was burned at the Alexandria Library, and in 400 BC a Greek explorer (Heroditus?) was told by Egyptian priests about things that were 9,000 years older.
You ever read a book called The Hab Theory?
It is about the sudden - and very catastrophic - shift of the Earths crust, and was immediately discounted, refuted, defamed by scientists worldwide, due to the polar bulge, etc, etc, etc.
Until recently. Recent findings and developments on the fluid flows in the Earths mantle have actually described such a flip.