[RioSmith]

Sea temperatures also shot upward 10º to 18ºF just prior to the last ice age. How do we know this?

[kabar]

According to paleontologist Dewey McLean, a good portion of the Deccan Traps was submarine. This would explain why ocean temperatures at the dinosaur extinction rose by some 14° to 22°F. See http://filebox.vt.edu/artsci/geology/mclean/Dinosaur_Volcano_Extinction/index.html