Callovian

Callovian
165.3 ± 1.1 – 161.5 ± 1.0 Ma
Chronology
Etymology
Name formalityFormal
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unitAge
Stratigraphic unitStage
Time span formalityFormal
Lower boundary definitionFAD of the Ammonite genus Kepplerites
Lower boundary GSSP candidate section(s)
Upper boundary definitionFAD 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]

  1. ^ "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy.
  2. ^ "International Commission on Stratigraphy". stratigraphy.org. Retrieved 2023-02-20.
  3. ^ See for a detailed geologic timescale Gradstein et al. (2004)