Geological Time Scale |
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| Era | Period | Epoch | Start before Million Years |
| Caenozoic | Quarternary | Holocene - recent period Pleistocene |
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| Tertiary | Pliocene Miocene Oligocene Eocene Palaeocene |
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| Mesozoic | Cretaceous | Upper Cretaceous Lower Cretaceous |
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| Jurassic | |||
| Triassic | |||
| Palaeozoic | Permian | ||
| Carboniferous | Upper Carboniferous Lower Carboniferous |
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| Devonian | Upper Devonian Middle Devonian Lower Devonian |
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| Silurian | Gotlandium Ordovician |
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| Cambrian | Upper Cambrian Middle Cambrian Lower Cambrian |
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| Proterozoic | Precambrian | ca. 1800 > 3000 |
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| Archaean | |||