Geological Timeline
This geological timeline divides the last 4.5 billion years on earth into eons, eras, periods, and epochs according to the most commonly accepted dates, terms and definitions.
| No. of years ago | (Epoch) / Period | Era | Eon | ||||
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4.5b - 3.8b | HADEON |
P R E C A M B R I A N |
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| 3.8b - 2.5b | ARCHEAN | ||||||
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2.5 b - 542m | PROTEROZOIC | ||||
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542m - 488.3m | Cambrian |
Paleozoic | PHANEROZOIC | ||
| 488.3m - 443.7m | Ordovician | ||||||
| M a j o r E x t i n c t i o n E v e n t | |||||||
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443.7m - 416m | Silurian |
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| 416m - 359.2m | Devonian | ||||||
| M a j o r E x t i n c t i o n E v e n t | |||||||
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359.2m - 299m | Carboniferous |
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| 299m - 251m | Permian | ||||||
| P e r m i a n - T r i a s s i c E x t i n c t i o n E v e n t | |||||||
| 251m - 199m | Triassic | Mesozoic | |||||
| M a j o r E x t i n c t i o n E v e n t | |||||||
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199m - 145.5m | Jurassic |
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| 145.5m - 65.5m | Cretaceous | ||||||
| C r e t a c e o u s - T e r t i a r y ( K - T ) E x t i n c t i o n E v e n t | |||||||
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65.5m - 56m | (Paleocene) | Paleogene | Cenozoic | ||
| 56m - 34m | (Eocene) | ||||||
| 34m - 23m | (Oligocene) | ||||||
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23m - 5.3m | (Miocene) |
Neogene | |||
| 5.3m - 2.588m | (Pliocene) | ||||||
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2.588m - 10,000 | (Pleistocene) |
Quaternary | |||
| 10,000 - present | (Holocene) | ||||||

















