| Pliensbachian | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 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 species Bifericeras donovani and genus Apoderoceras | ||||||||
| Lower boundary GSSP | Robin Hood's Bay, Yorkshire, England, UK 54°24′25″N 0°29′51″W / 54.4069°N 0.4975°W | ||||||||
| Lower GSSP ratified | March 2005[2] | ||||||||
| Upper boundary definition | Peniche, Portugal | ||||||||
| Upper boundary GSSP | FAD of the Ammonite D. (E.) simplex 39°22′15″N 9°23′07″W / 39.3708°N 9.3853°W | ||||||||
| Upper GSSP ratified | 2014[3] | ||||||||
The Pliensbachian is an age of the geologic timescale and stage in the stratigraphic column. It is part of the Early or Lower Jurassic Epoch or Series and spans the time between 192.9 ±0.3 Ma and 184.2 ±0.3 Ma (million years ago).[4] The Pliensbachian is preceded by the Sinemurian and followed by the Toarcian.[5]
The Pliensbachian ended with the extinction event called the Toarcian turnover. During the Pliensbachian, the middle part of the Lias was deposited in Europe. The Pliensbachian is roughly coeval with the Charmouthian regional stage of North America.