Climate Change Evidence
Glaciation associated with Ordovician ME.
Equivocal evidence for global cooling during Devonian, Cretaceous, and Permian ME’s.
No major glaciation associated with Triassic ME.
A major glaciation ca. 300 million years ago and lasting 90 million yrs did not result in an ME.
Tentative Conclusion: glaciations are not currently regarded as a necessary cause for ME’s.