A few years back I noted a map of Earth temperatures Palaeocene-Eocene. The Palaeocene where we find it was already 5 K warmer than now; it was upon that baseline the temperatures spiked, the "PETM" event. This was mused due to a volcano. But where?
h/t Reynolds: North Atlantic, from Iceland to the Eriador Ridge 1000 km away. The ocean already existed but was 56 million years younger. (Same with South Atlantic really, hence the American monkey.) Also the plume had already been active 63-54 Mya which by-the-way helps explain that 5 K warming before the spike (worldwide or just hemispheric?).
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