The Cretaceous Era spanned from 136 million to 65 million years ago. The Cretaceous was warming period. Antarctica was a tropical region with plants and trees. The Cretaceous/ Tertiary Extinction (K/T in German). ended the Cretaceous Era.

Dr. Gerta Keller has introduced the concept, with good evidence, that the K/T extinction was not due to an asteroid strike. Rather, the Great Extinctions were due to extensive volcanism. Even a powerful asteroid strike would not cause the ocean acidification which caused the extinction of marine life (This is known).

It is very well known that Cooling Periods were accompanied by volcanism. Vice versa for Warming Periods. Extensive volcanism from Gravity Waves would boil up more water in the South Pacific to cause abundant snow and precipitation in the Northern Hemisphere and form glaciers.

So warmth in one place causes coolth in another place. Just like the climate hysterics are saying.