Geologic Time Scale

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Last updated 2:35 AM on 4/8/26
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18 Terms

1
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Eons order

Hadean → Archean → Proterozoic → Phanerozoic

2
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Phanerozoic Eon era order

Paleozoic → Mesozoic → Cenozoic

3
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Paleozoic Era period order

Cambrian → Ordovician → Silurian → Devonian → Mississippian → Pennsylvanian → Permian (“Classes Of Students Detest Memorizing Pointless Periods”)

4
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Mesozoic Era period order

Triassic → Jurassic → Cretaceous

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Cenozoic Era period order

Paleogene → Neogene → Quaternary

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Quaternary Period epoch order

Pleistocene → Holocene

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Hadean Eon timeframe

4.6-4.0 billion years ago

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Archean Eon timeframe

4.0-2.5 billion years ago

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Proterozoic Eon timeframe

2.5 billion years ago - 541 million years ago

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Phanerozoic Eon timeframe

541 million years ago - present

11
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Paleozoic Era timeframe

541 million years ago - 252 million years ago

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Mesozoic Era timeframe

252 million years ago - 66 million years ago

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Cenozoic Era timeframe

66 million years ago - present

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Palogene Period timeframe

66 million years ago - 23 million years ago

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Neogene Period timeframe

23 million years ago - 2.6 million years ago

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Quaternary Period timeframe

2.6 million years ago - present

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Pleistocene Epoch timeframe

2.6 million years ago - 11.7 thousand years ago

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Holocene Epoch timeframe

11.7 thousand years ago - present