: Paleoclimatology: Visean

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Visean

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. The Viséan Stage was named after the city of Visé in Belgium's Liège Province. Before being used as an international stage, the Visean Stage was part of the (West) European regional geologic time scale, in which it followed the Tournaisian Stage and is followed by the Namurian Stage. The base of the Viséan Stage is at the first appearance of the fusulinid species Eoparastaffella simplex (morphotype 1/morphotype 2). The top (the base of the Serpukhovian and Namurian) is laid at the first appearance of the conodont Lochriea ziegleri, or at the base of the biozone of goniatite Cravenoceras leion. The Carboniferous-Earliest Permian Biodiversification Event began in the Viséan, coinciding with the start of the main phase of the Late Palaeozoic Ice Age. The late Viséan saw the widespread reappearance of metazoan reefs after their devastation during the Hangenberg Event. (Adapted from: https://en.wikipedia.org/wiki/Vis%C3%A9an)

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