Posted: Aug 2, 08 7:32am

ScienceDaily (Aug. 1, 2008) — Geoscientists have long presumed that, like today, the tropics remained warm throughout Earth's last major glaciation 300 million years ago. New evidence, however, indicates that cold temperatures in fact episodically gripped these equatorial latitudes at that time.

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Climate model simulations are unable to replicate such cold tropical conditions for this time period, said Soreghan. "We are left with the prospect that what has been termed our 'best-known' analogue to Earth's modern glaciation is in fact poorly known."

http://www.sciencedaily.com/releases/2008/07/080731140227.htm

Evidence comes from the Rocky Mountains which were in the tropics, part of Pangaea, at the time.