Earth Science
Geologic Time Scale
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Athro, Limited
Earth Science
Geologic Time Scale
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| The geologic time scale |
How long is Geologic Time? Millions of years are hard to imagine. Try our Geological time scale metaphor calculator.
How well do you know the Geologic time scale? Try our time scale quiz
| Eon | Era | Period | Events |
| Phanerozoic (544ma-today) |
Cenozoic (64.5ma-today) |
Neogene (23ma-today) |
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Recent Pleistocene Pliocene Miocene |
Modern Mass Extinction |
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| Paleogene (64.5ma-23ma) |
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Oligocene Eocene Paleocene |
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| Mesozoic (245ma-64.5ma) |
Cretaceous (146ma-64.5ma) |
End Cretaceous Mass Extinction |
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| Jurassic (208ma-146ma) |
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| Triassic (245ma-208ma) |
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| Paleozoic (544ma-245ma) |
Permian (286ma-245ma) |
End Permian Mass Extinction |
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| Carboniferous (360ma-286ma) Pennsylvanian(US) Mississippian(US) |
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| Devonian (410ma-360ma) |
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| Silurian (440ma-410ma) |
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| Ordovician (505ma-440ma) |
First Snails | ||
| Cambrian (544ma-505ma) |
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| Proterozoic (2500ma-544ma) |
Neoproterozoic (900ma-544ma) |
Ediacaran fauna Vendian Glaciation Crown eukariote radiation |
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| Mesoproterozoic (1600ma-900ma) |
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| Paleoproterozoic (2500ma-900ma) |
Oxygen in atmosphere Formation of Continental Plates |
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| Archean (3800ma-2500ma) |
Origin of life | ||
| Hadean (4600ma-3800ma) |
No surviving rocks on earth Ocean vaporizing meteor impacts Accretion of Earth |