9.6 – The Geologic Time Scale

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11 Terms

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Eon

Largest division of geologic time.
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Phanerozoic

Eon meaning “visible life.”
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Precambrian

Eon containing Archean + Proterozoic.
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Era

Major life changes (Paleozoic, Mesozoic, Cenozoic).
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Period

More specific life changes (e.g., Jurassic).
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Epoch

Finer time divisions (e.g., Holocene, Pleistocene).
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Precambrian – Characteristics

88% of Earth history.
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Precambrian – Fossils

Few fossils; mostly soft-bodied life.
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Precambrian – Rocks

Rocks heavily metamorphosed; harder to interpret.
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Dynamic Time Scale

Updated as new data emerges (e.g., Quaternary revised to 2.6 Ma).
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Geologic time scale from largest to smallest

Eon → Era → Period → Epoch