Geologic time scale
Geologic time scale
System that relates geologic strata to time.
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Readers' pathsAug 2026 – Oct 2026
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Hadean
Geologic eon, 4567–4031 million years ago.
9.3%
Phanerozoic
Fourth and current eon of the geological timescale.
5.3%
Archean
Geologic eon, 4031–2500 million years ago.
4.5%
Proterozoic
Geologic eon, 2500–539 million years ago.
4%
Cenozoic
Third and current era of the Phanerozoic Eon.
3.1%
Holocene
Current geological epoch.
2.8%
Eonothem
Totality of rock strata laid down during a certain eon of the geologic timescale.
2.6%
Paleozoic
First era of the Phanerozoic Eon.
2.2%
Quaternary
Third and current period of the Cenozoic Era, from 2.58 million years ago to the present.
2%
Mesozoic
Second era of the Phanerozoic Eon.
1.9%
Readers come from
Share of the 84,517 readers arriving from another article
Phanerozoic
Fourth and current eon of the geological timescale.
9.1%
Holocene
Current geological epoch.
5.7%
Hadean
Geologic eon, 4567–4031 million years ago.
4.7%
Mesozoic
Second era of the Phanerozoic Eon.
4.4%
Pleistocene
First epoch of the Quaternary Period.
3.2%
Cretaceous
Third and last period of the Mesozoic Era.
3%
Paleozoic
First era of the Phanerozoic Eon.
2.5%
Jurassic
Second period of the Mesozoic Era.
2.4%
Precambrian
History of Earth 4600–539 million years ago.
2.4%
Cenozoic
Third and current era of the Phanerozoic Eon.
2.1%