Toarcian

Also known as Toarcian Age, Toarcian Stage

The Toarcian is, in the ICS' geologic timescale, an age and stage in the Early or Lower Jurassic. It spans the time between 184.2 Ma (million years ago) and 174.7 ±0.8 Ma. It follows the Pliensbachian and is followed by the Aalenian.

Key facts

Geologic timespan.name: Toarcian
Geologic timespan.color: Toarcian
Geologic timespan.time_start: 184.2
Geologic timespan.time_start_uncertainty: 0.3
Geologic timespan.time_end: 174.7
Geologic timespan.time_end_uncertainty: 0.8
Geologic timespan.image_map: File:180Ma Mollweide.png
Geologic timespan.caption_map: Map of Earth at 180 million years ago; the boundaries of present-day landmasses, countries, and states are superimposed as black outlines
Geologic timespan.timeline: Jurassic
Geologic timespan.name_formality: Formal
Geologic timespan.celestial_body: earth
Geologic timespan.usage: Global (ICS)
Geologic timespan.timescales_used: ICS Time Scale
Geologic timespan.chrono_unit: Age
Geologic timespan.strat_unit: Stage
Geologic timespan.timespan_formality: Formal
Geologic timespan.lower_boundary_def: Peniche, Portugal
Geologic timespan.lower_gssp_location: FAD of the Ammonite D. (E.) simplex

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sRGB color hex triplet: 74D1F0
start time: 182700000-
end time: 174100000-

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Stratigraphic definitions
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The Toarcian Age began with the Toarcian Oceanic Anoxic Event, a major anoxic event associated with marine extinctions and increased global temperatures that sets its fossil faunas apart from the previous Pliensbachian age. It is believed to have ended with a global cooling event known as the Comptum Cooling Event, although whether it represented a worldwide event is controversial.