Turonian
The Turonian is, in the ICS' geologic timescale, the second age in the Late Cretaceous Epoch, or a stage in the Upper Cretaceous Series. It spans the time between 93.9 ± 0.8 Ma and 89.8 ± 1 Ma (million years ago). The Turonian is preceded by the Cenomanian Stage and underlies the Coniacian Stage.
| Turonian | |||||||||
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Paleogeography of the late Turonian (90 Ma), showing the high sea level at the time | |||||||||
| 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 Watinoceras devonense | ||||||||
| Lower boundary GSSP | Rock Canyon, Colorado, USA 38.2822°N 104.7275°W | ||||||||
| Lower GSSP ratified | September 2003 | ||||||||
| Upper boundary definition | Not formally defined | ||||||||
| Upper boundary definition candidates | FAD of the Inoceramid Bivalve Cremnoceramus rotundatus | ||||||||
| Upper boundary GSSP candidate section(s) |
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At the beginning of the Turonian an oceanic anoxic event (OAE 2) took place, also referred to as the Cenomanian-Turonian boundary event or the "Bonarelli Event". Sea level fall took place in the latter part of the Turonian from the highstand at the beginning of the Turonian.
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