Eocene-Oligocene Extinction (34 million years ago) β #10 in Top 10 Worst Extinction Events in History | Top10Grid
#10
Eocene-Oligocene Extinction (34 million years ago)
Dramatic global cooling transformed lush forests into open grasslands, driving mass extinctions of tropical marine and terrestrial species while giving rise to the modern fauna of horses, dogs, and grasses.
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