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Timeline of Earth's Mass Extinctions

439 million years ago

Ordovician–Silurian extinction events

86% OF LIFE

364 million years ago

Late Devonian extinction

75% OF LIFE

251 million years ago

Permian–Triassic extinction event

LIFE TODAY DESCENDS FROM 4% SURVIVING

199 million to 214 million years ago

Triassic–Jurassic extinction event

MAMMALS OUTNUMBER DINOSAURS

65 million years ago

Cretaceous–Paleogene extinction event

BIG ONE: WIPED OUT DINOSAURS

PRESENT

Holocene extinction

CAUSED BY HUMANS

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