Artinskian

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Artinskian
290.1 ± 0.26 – 283.5 ± 0.6 Ma
Chronology

In the

million years ago (Ma) according to the most recent revision of the International Commission on Stratigraphy (ICS) in 2022.[1] It was preceded by the Sakmarian and followed by the Kungurian
.

Stratigraphy

Jimbacrinus bostocki Artinskian of Australia. (Found near Jimba Jimba Station )

The Artinskian is named after the goniatite grits of Artinsk which was introduced by

Urals, about 170 km southwest of Yekaterinburg. The stage was introduced into scientific literature by Alexander Karpinsky in 1874.[4]

Base of the Artinskian

The base of the Artinskian Stage is defined as the

Mesogondolella bisselli. In order to constrain this age, the ICS subcommission on Permian stratigraphy informally proposed a candidate GSSP in 2002, later followed by a formal proposal in 2013. The proposed GSSP location — the Dal'ny Tulkas roadcut in the Southern Urals, near the town of Krasnousolsky[5] — was eventually ratified in February 2022.[2]

U-Pb radiometric dating found that the base of the Artinskian was approximately 290.1 million years old (Ma), based on the position of the rock layer at the Dal'ny Tulkas roadcut containing the FAD of S. whitei relative to three precisely dated ash beds surrounding it.[6] Earlier radiometric reported a much younger age of 280.3 Ma for the Sakmarian-Artinskian boundary.

Top of the Artinskian

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.[4] The proposed GSSP candidate — the Mechetlino section (Southern Urals).[7]

Artinskian Warming Event

Around 287 million years ago occurred an interval of pronounced warming known as the Artinskian Warming Event (AWE). This period of

brachiopod fossils,[11] with arid and semi-arid conditions expanding across much of Pangaea as glaciers receded to refugia in the polar regions of Gondwana.[8]

References

  1. ^ a b "Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.
  2. ^ a b "Ratification of Artinskian GSSP". International Commission on Stratigraphy. Retrieved 23 March 2022.
  3. ^ A. Karpinsky. Artinsk ammonitae of Novaya Zemlya (posthumous edition). Moscow, Leningrad,1949
  4. ^
    ISBN 9780521786737
    .
  5. ^ Chuvashov, Boris I.; Chernykh, Valery V.; Shen, Shuzhong; Henderson, Charles M. (2013). "Proposal for the Global Stratotype Section and Point (GSSP) for the base-Artinskian Stage (Lower Permian)". Permophiles. 58: 26–34.
  6. doi:10.1130/B30385.1
    .
  7. S2CID 188086370.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  8. ^
    S2CID 245892961
    . Retrieved 30 October 2022.
  9. S2CID 133713470
    . Retrieved 30 October 2022.
  10. doi:10.1016/j.palaeo.2015.03.020
    .
  11. doi:10.1016/j.palaeo.2008.03.053
    . Retrieved 30 October 2022.

External links
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