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age of earth
4.54 billion years
origin of life
4-3.8 billion years ago
great oxidation event
2.4 billion years ago
eukaryotes
1.8 billion years ago
earliest animal fossils
635-542 million years ago
cambrian explosion
538 million years ago
terrestrial plants and animals
444-419 million years ago
terrestrial vertebrates
419-359 million years ago
the great dying
252 million years ago
dinosaurs
252-66 million years ago
mammals
167 million years ago
flowering plants
143 million years ago
cretaceous-tertiary extinction
66 million years ago
great apes
17 million years ago
modern humans
300,000 years ago