Viséan
The Visean, Viséan or Visian is an age in the ICS geologic timescale or a stage in the stratigraphic column. It is the second stage of the Mississippian, the lower subsystem of the Carboniferous. The Visean lasted from 346.7 to 330.9 Ma. It follows the Tournaisian age/stage and is followed by the Serpukhovian age/stage.
| Viséan | |||||||||||||||
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Paleogeography of the late Viséan | |||||||||||||||
| Chronology | |||||||||||||||
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| Etymology | |||||||||||||||
| Name formality | Formal | ||||||||||||||
| Alternate spelling(s) | Visean, Visian | ||||||||||||||
| 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 benthic foraminifer Eoparastaffella simplex | ||||||||||||||
| Lower boundary GSSP | Pengchong Section, Guangxi, China 24.4333°N 109.4500°E | ||||||||||||||
| Lower GSSP ratified | 2008 | ||||||||||||||
| Upper boundary definition | Not formally defined | ||||||||||||||
| Upper boundary definition candidates | FAD of the conodont Lochriea ziegleri | ||||||||||||||
| Upper boundary GSSP candidate section(s) |
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