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4600 BCE
Formation of Earth
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Period: 4600 BCE to 4000 BCE
Hadeon Eon
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4500 BCE
Loss of Earth's atmosphere
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4404 BCE
First appearance of liquid
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4280 BCE
Earliest appearance of life
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Period: 4000 BCE to 2500 BCE
Archean Eon
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3500 BCE
Lifetime of the last universal ancestor
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3500 BCE
First procaryotes
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3000 BCE
Evolution of photosynthesising cyanobacteria
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2500 BCE
Great oxygenation event
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Period: 2500 BCE to 542 BCE
Proterozoic Eon
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2000 BCE
Diversification and expansion of acritarchs
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1500 BCE
First eucaryotes
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800 BCE
First multicellular organisms
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750 BCE
First protozoa
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650 BCE
First soft-bodied organisms
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600 BCE
Formation of ozone layer
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570 BCE
First arthropods evolve
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Period: 543 BCE to 1 CE
Phanerozoic Eon
-
540 BCE
First trilobites
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530 BCE
First fish
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475 BCE
First land plants
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410 BCE
Fish become abundant
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385 BCE
First forests
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370 BCE
First amphibians
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350 BCE
Earliest reptiles
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225 BCE
Evolution of dinosaurs
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208 BCE
First birds
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200 BCE
Evolution of mammals
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130 BCE
Evolution of flowering plants
-
100 BCE
First bees
-
65 BCE
Mass extinction
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65 BCE
Dinosaurs and ammonites become extinct
-
60 BCE
First large mammals
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14 BCE
First great apes appear
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2 BCE
Genus homo evolve