Back in 2008 the National Science Foundation published the results of a study pertaining to glaciers in the tropics which I find rather interesting.
Geoscientists have long believed that the tropics remained warm during the Earth’s glaciation periods but new evidence reveals this may NOT be the case at all. This evidence appears to show that cold temps periodically gripped the equatorial latitudes during some of glacial periods.
Research conducted by Oklahoma University geologist Gerilyn Soreghan found evidence of an ancient glacier in Colorado’s Rocky Mountains which 300 mya was part of the tropics. This was during the era of the super-continent known as Pangaea. This study was a shining example of the great amount of untapped climate information stored in the planet’s deep time geologic records millions of years old.
The study indicated that the “toes” of the glaciers were most likely LESS than 500 meters (547 yards) above sea level which is much lower than the tropical glaciers in more recent glacial times.
So during the Late Paleozoic tropical climate zones were NOT immune against the cold as we have thought! In fact the evidence from this study indicates glaciers were common even in the tropical latitudes! The evidence supports the notion that large scale climate change took place in the tropics during this time and possibly other times. And so, what we once thought…was, and what we once thought was not….turns out to be “was.”