Callovian | |||||||||
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Chronology | |||||||||
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Etymology | |||||||||
Name formality | Formal | ||||||||
Usage information | |||||||||
Celestial body | Earth | ||||||||
Regional usage | Global (ICS) | ||||||||
Time scale(s) used | ICS Time Scale | ||||||||
Definition | |||||||||
Chronological unit | Age | ||||||||
Stratigraphic unit | Stage | ||||||||
Time span formality | Formal | ||||||||
Lower boundary definition | FAD of the Ammonite genus Kepplerites | ||||||||
Lower boundary GSSP candidate section(s) | |||||||||
Upper boundary definition | FAD of ammonite species Brightia thuouxensis | ||||||||
Upper boundary GSSP candidate section(s) |
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]
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