Gzhelian
Seventh and final stage of the Carboniferous / From Wikipedia, the free encyclopedia
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The Gzhelian (/ˈʒɛli.ən/ ZHELL-ee-ən) is an age in the ICS geologic time scale 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.[4] It follows the Kasimovian age/stage and is followed by the Asselian age/stage, the oldest subdivision of the Permian system.
Quick Facts Chronology, Etymology ...
Gzhelian | |||||||||||||||
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303.7 ± 0.1 – 298.9 ± 18.9 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 | ||||||||||||||
Type section | Gzhel horizon, Ghzel, Moscow Oblast, Russia | ||||||||||||||
Lower boundary definition | Not formally defined | ||||||||||||||
Lower boundary definition candidates | FAD of the Conodont Idiognathodus simulator[2] | ||||||||||||||
Lower boundary GSSP candidate section(s) |
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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 / 50.2458; 57.8914 | ||||||||||||||
Upper GSSP ratified | 1996[3] |
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The Gzhelian is more or less coeval with the Stephanian Stage of the regional stratigraphy of Europe.