Gzhelian
The Gzhelian (/ˈʒɛli.ən/ ZHELL-ee-ən) is an age in the ICS geologic timescale or a stage in the stratigraphic column. It is the youngest stage of the Pennsylvanian, the youngest subsystem of the Carboniferous. The Gzhelian lasted from 303.7 to 298.9 Ma. It follows the Kasimovian age/stage and is followed by the Asselian age/stage, the oldest subdivision of the Permian system.
| Gzhelian | |||||||||||||||
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Type locality for the Gzhelian in Gzhel, Russia | |||||||||||||||
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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 | ||||||||||||||
| Type section | Gzhel horizon, Ghzel, Moscow Oblast, Russia | ||||||||||||||
| Lower boundary definition | Not formally defined | ||||||||||||||
| Lower boundary definition candidates | FAD of the Conodont Idiognathodus simulator | ||||||||||||||
| Lower boundary GSSP candidate section(s) | |||||||||||||||
| Upper boundary definition | FAD of the Conodont Streptognathodus isolatus within the morphotype Streptognathodus wabaunsensis chronocline | ||||||||||||||
| Upper boundary GSSP | Aidaralash, Ural Mountains, Kazakhstan 50.2458°N 57.8914°E | ||||||||||||||
| Upper GSSP ratified | 1996 | ||||||||||||||
The Gzhelian is more or less coeval with the Stephanian Stage of the regional stratigraphy of Europe.
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