Geological eons, eras and periods

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Last updated: October 2, 2019

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First submitted	October 1, 2019
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Eons	Name	Etymology (Greek)
4.6-4.0 billion years ago	Hadean	Underworld
4.0-2.5 bya	Archean	Origin
2.5 bya-541 million years ago	Proterozoic	Early life
541 mya to present	Phanerozoic	Visible life
Eras of current eon
541-252 mya	Paleozoic	Old life
252-66 mya	Mesozoic	Middle life
66 mya to present	Cenozoic	New life
Periods of current eon
Everything before current eon	Precambrian
541-485 mya	Cambrian	Wales (Latin)
485-443 mya	Ordovician	A Celtic tribe from Wales
443-419 mya	Silurian	A Celtic tribe from Wales
419-359 mya	Devonian	Devon, England
359-299 mya	Carboniferous	Coal-bearing (Latin)
299-252 mya	Permian	Perm, Russia
252-201 mya	Triassic	Three
201-145 mya	Jurassic	Jura Mountains in the Alps
145-66 mya	Cretaceous	Chalk (Latin)
66-23 mya	Paleogene	Old born
23-2.58 mya	Neogene	New born
2.58 mya to present	Quaternary	Four (Latin)
Epochs of current period
2.58 mya-11.7 thousand years ago	Pleistocene	Most new
11.7 thousand years ago to present	Holocene	Entirely new

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