Toarcian
Fourth and last age of the Early Jurassic / From Wikipedia, the free encyclopedia
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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.[4] It follows the Pliensbachian and is followed by the Aalenian.[5]
Quick Facts Chronology, Etymology ...
Toarcian | |||||||||
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184.2 ± 0.3 – 174.7 ± 0.8 Ma | |||||||||
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 | Peniche, Portugal | ||||||||
Lower boundary GSSP | FAD of the Ammonite D. (E.) simplex 39.3708°N 9.3853°W / 39.3708; -9.3853 | ||||||||
Lower GSSP ratified | 2014[2] | ||||||||
Upper boundary definition | FAD of the Ammonites Leioceras opalinum and Leioceras lineatum | ||||||||
Upper boundary GSSP | Fuentelsaz, Spain 41.1708°N 1.8333°W / 41.1708; -1.8333 | ||||||||
Upper GSSP ratified | 2000[3] |
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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.[6]