9.6 – The Geologic Time Scale
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Last updated 6:43 PM on 12/6/25
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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
Note 
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