Frosty times for dinosaurs: Major fall in temperature 137 million years ago during Cretaceous greenhouse period, evidence shows

New research sheds light on a major drop in temperature 137 million years ago, which briefly interrupted the warm, equable climate of the Cretaceous Period. Dinosaurs inhabited the polar regions during the Cretaceous greenhouse period. While marine reptiles such as pliosaurs and ichthyosaurs may have migrated with the onset of the cold snap, it is not clear how dinosaurs would have handled the colder conditions.

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