The evolution of cetaceans is thought to have proceeded in modern day Pakistan during the Eocene epoch (56–34 mya), the second epoch of the Paleogene period of the present-extending Cenozoic Era. Specifically, cetaceans are thought to have transitioned from land to water at the tailend of the Paleocene–Eocene transition about 56 Mya, which was marked by increased global temperatures of 5.6°C, warming the earths oceans.
The evolution of cetaceans is thought to have proceeded in modern day Pakistan during the Eocene epoch (56–34 mya), the second epoch of the Paleogene period of the present-extending Cenozoic Era. Specifically, cetaceans are thought to have transitioned from land to water at the tailend of the Paleocene–Eocene transition about 56 Mya, which was marked by increased global temperatures of 5.6°C, warming the earths oceans.
Source: Wikipedia "Evolution of cetaceans" · CC BY-SA 4.0
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