Kasimovian

Kasimovian
Kasimovian
307.0 ± 0.1 – 303.7 ± 0.1Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Chronology
←	Carboniferous Rainforest Collapse
←	Mazon Creek Fossils
←	End ofRomer's Gap
←	Start ofRomer's Gap
	Subdivision of the Carboniferous according to theICS,as of 2023.; Vertical axis scale: Millions of years ago;
Etymology
Name formality	Formal
Usage information
Celestial body	Earth
Regional usage	Global (ICS)
Time scale(s) used	ICS Time Scale
Definition
Chronological unit	Age
Stratigraphic unit	Stage
Time span formality	Formal
Lower boundary definition	Not formally defined
Lower boundary definition candidates	FADof theFusulinidProtriticitesor 1 million years olderMontiparus montiparus
Lower boundary GSSP candidate section(s)	SouthernUral Mountains; SouthwestUSA; Nashui,Luodian County,Guizhou,China;
Upper boundary definition	Not formally defined
Upper boundary definition candidates	FAD of theConodontIdiognathodus simulator
Upper boundary GSSP candidate section(s)	Southern Ural mountains; Nashui, Luodian County, Guizhou, China;

TheKasimovianis ageochronologic ageorchronostratigraphic stagein theICS geologic timescale.It is the third stage in thePennsylvanian(lateCarboniferous), lasting from 307 to 303.7Ma.^[3]The Kasimovian Stage follows theMoscovianand is followed by theGzhelian. The Kasimovian saw an extinction event which occurred around 305 mya, referred to as theCarboniferous Rainforest Collapse.^[4]It roughly corresponds to theMissourianin North American geochronology and theStephanianin western European geochronology.

Name and definition

The Kasimovian is named after theRussiancity ofKasimov.The stage was split from the Moscovian in 1926 by Boris Dan'shin (1891-1941), who gave it the nameTeguliferina horizon.The name was posthumously changed toKasimov horizonby 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 thefusulinid biozoneofObsoletes obsoletesandProtriticites pseudomontiparusor with the first appearance of theammonite genusParashumardites.The top of the stage is close to the first appearances of the fusulinid generaDaixina,JigulitesandRugosofusulinaor the first appearance of the conodontStreptognathodus zethus.

Biozones

The Kasimovian is subdivided into three conodontbiozones:

IdiognathodustoretzianusZone
Idiognathodus sagittatusZone
Streptognathodus excelsusandStreptognathodus makhlinaeZone

References

^"International Chronostratigraphic Chart"(PDF).International Commission on Stratigraphy.September 2023.RetrievedNovember 10,2024.
^^a ^b ^c ^d"Global Boundary Stratotype Section and Point".International Commission of Stratigraphy.Retrieved23 December2020.
^Gradstein, F.M.; Ogg, J.G. & Smith, A.G.;2004:A Geologic Time Scale 2004,Cambridge UniversityPress.
^Sahney, S., Benton, M.J. & Falcon-Lang, H.J. (2010)."Rainforest collapse triggered Pennsylvanian tetrapod diversification in Euramerica"(PDF).Geology.38(12): 1079–1082.Bibcode:2010Geo....38.1079S.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, Palaeoecology240(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

Carboniferous timescaleat the website of the Norwegian network of offshore records of geology and stratigraphy
Kasimovian,GeoWhen Database

[1] "International Chronostratigraphic Chart"(PDF).International Commission on Stratigraphy.September 2023.RetrievedNovember 10,2024.

[GSSP_Web-2] "Global Boundary Stratotype Section and Point".International Commission of Stratigraphy.Retrieved23 December2020.

[3] Gradstein, F.M.; Ogg, J.G. & Smith, A.G.;2004:A Geologic Time Scale 2004,Cambridge UniversityPress.

[SahneyBentonFerry2010RainforestCollapse-4] Sahney, S., Benton, M.J. & Falcon-Lang, H.J. (2010)."Rainforest collapse triggered Pennsylvanian tetrapod diversification in Euramerica"(PDF).Geology.38(12): 1079–1082.Bibcode:2010Geo....38.1079S.doi:10.1130/G31182.1.{{cite journal}}:CS1 maint: multiple names: authors list (link)

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