Fourth and last age of the middle Jurassic
| Callovian |
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−200 — – −195 — – −190 — – −185 — – −180 — – −175 — – −170 — – −165 — – −160 — – −155 — – −150 — – −145 — – | | | Subdivision of the Jurassic according to the ICS, as of 2023.[1]Vertical axis scale: millions of years ago. |
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| Name formality | Formal |
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| Celestial body | Earth |
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| Regional usage | Global (ICS) |
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| Time scale(s) used | ICS Time Scale |
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| Chronological unit | Age |
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| Stratigraphic unit | Stage |
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| Time span formality | Formal |
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| Lower boundary definition | FAD of the Ammonite genus Kepplerites |
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| Lower boundary GSSP candidate section(s) |
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| Upper boundary definition | FAD of ammonite species Brightia thuouxensis |
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| Upper boundary GSSP candidate section(s) |
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In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 165.3 ± 1.1 Ma (million years ago) and 161.5 ± 1.0 Ma.[2] It is the last stage of the Middle Jurassic, following the Bathonian and preceding the Oxfordian.[3]