Concept information
Terme préférentiel
Artinskian
Définition
- In the geologic timescale, the Artinskian is an age or stage of the Permian. It is a subdivision of the Cisuralian Epoch or Series. The Artinskian likely lasted between 290.1 and 283.5 million years ago (Ma) according to the most recent revision of the International Commission on Stratigraphy (ICS) in 2022. It was preceded by the Sakmarian and followed by the Kungurian. The grits of Artinsk, in turn, get its name from the Artinsky District with center in the Russian smalltown of Arti (formerly Artinsk zavod), situated in the middle Urals, about 170 km southwest of Yekaterinburg. The base of the Artinskian Stage is defined as the first appearance datum (FAD) of the conodont species Sweetognathus whitei and Mesogondolella bisselli. The top of the Artinskian (and the base of the Kungurian) is defined as the place in the stratigraphic record where fossils of conodonts Neostreptognathodus pnevi and Neostreptognathodus exculptus first appear. Around 287 million years ago occurred an interval of pronounced warming known as the Artinskian Warming Event (AWE). This period of global warming accelerated the deglaciation that had been occurring since the Sakmarian following the end of the most intense glacial phase of the Late Palaeozoic Ice Age. In addition, it is also associated with significant global drying, which had gradually been occurring since the Carboniferous-Permian boundary. Major aridification during the AWE is evidenced by a positive δ18O excursion observed in brachiopod fossils, with arid and semi-arid conditions expanding across much of Pangaea as glaciers receded to refugia in the polar regions of Gondwana. (Adapted from: https://en.wikipedia.org/wiki/Artinskian)
Concept générique
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URI
http://data.loterre.fr/ark:/67375/QX8-VT8G81FM-7
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