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An eon is the second largest unit of time on the geologic time scale. It does not have a fixed duration, but eons start and end with major changes in Earth's geological evolution. There have been four eons since the formation of Earth: * Hadean (4.5 to 3.8 billion years ago) * Archean (3.8 to 2.5 billion years ago) * Proterozoic (2.5 to 0.5 billion years ago) * Phanerozoic (0.5 billion years ago to the present)

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  • How long is an eon
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  • An eon is the second largest unit of time on the geologic time scale. It does not have a fixed duration, but eons start and end with major changes in Earth's geological evolution. There have been four eons since the formation of Earth: * Hadean (4.5 to 3.8 billion years ago) * Archean (3.8 to 2.5 billion years ago) * Proterozoic (2.5 to 0.5 billion years ago) * Phanerozoic (0.5 billion years ago to the present)
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abstract
  • An eon is the second largest unit of time on the geologic time scale. It does not have a fixed duration, but eons start and end with major changes in Earth's geological evolution. There have been four eons since the formation of Earth: * Hadean (4.5 to 3.8 billion years ago) * Archean (3.8 to 2.5 billion years ago) * Proterozoic (2.5 to 0.5 billion years ago) * Phanerozoic (0.5 billion years ago to the present)
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