Sinemurian
In the geologic timescale, the Sinemurian is an age and stage in the Early or Lower Jurassic Epoch or Series. It spans the time between 199.5 ±0.3 Ma and 192.9 ±0.3 Ma (million years ago). The Sinemurian is preceded by the Hettangian and is followed by the Pliensbachian.
| Sinemurian | |||||||||
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Jurassic rock strata in the cliffs at East Quantoxhead, near the Sinemurian golden spike. | |||||||||
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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 Ammonites Vermiceras quantoxense and Vermiceras palmeri | ||||||||
| Lower boundary GSSP | East Quantoxhead, West Somerset, England, UK 51.1909°N 3.2364°W | ||||||||
| Lower GSSP ratified | 2000 | ||||||||
| Upper boundary definition | FAD of the Ammonite species Bifericeras donovani and genus Apoderoceras | ||||||||
| Upper boundary GSSP | Robin Hood's Bay, Yorkshire, England, UK 54.4069°N 0.4975°W | ||||||||
| Upper GSSP ratified | March 2005 | ||||||||
In Europe the Sinemurian age, together with the Hettangian age, saw the deposition of the lower Lias, in Great Britain known as the Blue Lias.
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