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Topic summary

Bajocian

Bajocian
Subdivision of the Jurassic according to the ICS, as of 2024.
Vertical axis scale: Millions of years ago
EtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionFAD of the AmmonitesHyperlioceras mundum, Hyperlioceras furcatum, , and Lower boundary GSSPCabo Mondego, Portugal
40°11′57″N8°54′15″W / 40.1992°N 8.9042°W / 40.1992; -8.9042Lower GSSP ratified1996Upper boundary definitionFAD of the Ammonite Upper boundary GSSP, , , France
43°57′38″N6°18′55″E / 43.9606°N 6.3153°E / 43.9606; 6.3153Upper GSSP ratifiedJuly 2008

In the geologic timescale, the Bajocian is an age and stage in the Middle Jurassic. It lasted from approximately 170.9 ± 0.8 Ma to around 168.2 ± 1.2 Ma (million years ago). The Bajocian Age succeeds the Aalenian Age and precedes the Bathonian Age.

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