The geologic time scale is used by geologists, paleontologists, and other earth scientists to describe the timing and relationships between events that have occurred throughout Earth's history.
The geologic time scale starts with large divisions of time called eons and is subdivided into successively smaller units of time based on dominant lifeforms, extinction events, even climate.
Geological time scale
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Cenozoic
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Quaternary period
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Holocene epoch
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10,000 years
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Pleistocene epoch
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1.8 million years
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Tertiary period
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Pliocene
Miocene
Oligocene
Eocene
Palaeocene
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65.5 million years
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Mesozoic
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252 million years
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Palaeozoic
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542 million years
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Precambrian
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4.6 billion years
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