Kasimovian

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Kasimovian
307.0 ± 0.1 – 303.7 ± 0.1 Ma
↓
Chronology
Subdivision of the Carboniferous according to the ICS, as of 2021.[1]

Vertical axis scale: millions of years ago
EtymologyName formalityFormalUsage informationCelestial body
AgeStratigraphic unitStageTime span formalityFormalLower boundary definitionNot formally definedLower boundary definition candidatesFAD of the Fusulinid Protriticites or 1 million years older Montiparus montiparus[2]
Lower boundary GSSP candidate section(s) Upper boundary definitionNot formally definedUpper boundary definition candidatesFAD of the Conodont Idiognathodus simulator[2]Upper boundary GSSP candidate section(s)
  • Southern Ural mountains[2]
  • Nashui, Luodian County, Guizhou, China

The Kasimovian is a

Ma.[3] The Kasimovian Stage follows the Moscovian and is followed by the Gzhelian
. The Kasimovian saw an extinction event which occurred around 305 mya, referred to as the
Carboniferous Rainforest Collapse.[4] It roughly corresponds to the Missourian in North American geochronology and the Stephanian
in western European geochronology.

Name and definition

The Kasimovian is named after the Russian city of Kasimov. The stage was split from the Moscovian in 1926 by Boris Dan'shin (1891-1941), who gave it the name Teguliferina horizon. The name was posthumously changed to Kasimov horizon by Dan'shin in 1947. The name Kasimovian was introduced by Georgy Teodorovich in 1949.

The base of the Kasimovian Stage is at the base of the

Streptognathodus zethus
.

Biozones

The Kasimovian is subdivided into three conodont biozones:

  • Idiognathodus toretzianus Zone
  • Idiognathodus sagittatus Zone
  • Streptognathodus excelsus and Streptognathodus makhlinae Zone

References

  1. ^ "Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.
  2. ^ a b c d "Global Boundary Stratotype Section and Point". International Commission of Stratigraphy. Retrieved 23 December 2020.
  3. Cambridge University
    Press.
  4. doi:10.1130/G31182.1.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )

Literature

  • Dan'shin, V.M.; 1947: Geology and Mineral Resources of Moscow and its Surroundings, Izdat. Moskov. Obshch. Isp. Prir., Moscow, 308 pp. (in Russian).
  • Menning, M.; Alekseev, A.S.; Chuvashov, B.I.; Davydov, V.I.; Devuyst, F.-X.; Forke, H.C.; Grunt, T.A.; Hance, L.; Heckel, P.H.; Izokh, N.G.; Jin, Y.-G.; Jones, P.J.; Kotlyar, G.V.; Kozur, H.W.; Nemyrovska, T.I.; Schneider, J.W.; Wang, X.-D.; Weddige, K.; Weyer, D. & Work, D.M.; 2006: Global time scale and regional stratigraphic reference scales of Central and West Europe, East Europe, Tethys, South China, and North America as used in the Devonian–Carboniferous–Permian Correlation Chart 2003 (DCP 2003), Palaeogeography, Palaeoclimatology, Palaeoecology 240(1-2): pp 318–372.
  • Teodorovich, Georgy I. (1949). О подразделении верхнего карбона на ярусы [On the subdivision of the Upper Carboniferous into stages].
    Doklady Akademii Nauk SSSR
     (in Russian). 67 (3): 537–540.

External links
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