Kasimovian

System Subsystem/
Series
Stage Age
(Ma)
Permian Cisuralian Asselian younger
Carboniferous Pennsylvanian Gzhelian 298.9–303.7
Kasimovian 303.7–307.0
Moscovian 307.0–315.2
Bashkirian 315.2–323.2
Mississippian Serpukhovian 323.2–330.9
Viséan 330.9–346.7
Tournaisian 346.7–358.9
Devonian Late Famennian older
Subdivision of the Carboniferous system according to the ICS.[1]

The Kasimovian is an geochronologic age or chronostratigraphic stage in the ICS geologic timescale. It is the third stage in the Pennsylvanian (late Carboniferous), lasting from 307 to 303.7 Ma.[2] 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.[3]

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 in 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 fusulinid biozone of Obsoletes obsoletes and Protriticites pseudomontiparus or with the first appearance of the ammonite genus Parashumardites. The top of the stage is close to the first appearances of the fusulinid genera Daixina, Jigulites and Rugosofusulina or the first appearance of the conodont Streptognathodus zethus. The golden spike for the Kasimovian stage has not yet been assigned (in 2008).

Biozones

The Kasimovian is subdivided into three conodont biozones:

Notes

  1. "International Chronostratigraphic Chart". International Commission on Stratigraphy. Retrieved 9 May 2013.
  2. Gradstein et al. (2004)
  3. Sahney, S., Benton, M.J. & Falcon-Lang, H.J. (2010). "Rainforest collapse triggered Pennsylvanian tetrapod diversification in Euramerica" (PDF). Geology. 38 (12): 1079–1082. doi:10.1130/G31182.1.

Literature

External links


Carboniferous period
Mississippian Pennsylvanian

Carboniferous period
Mississippian Pennsylvanian
Lower/Early Middle Upper/Late Lower/Early Middle Upper/Late
Tournaisian Viséan Serpukhovian Bashkirian Moscovian Kasimovian | Gzhelian

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