Kasimovian

Kasimovian
Kasimovian
Chronology
←	Carboniferous Rainforest Collapse
←	Mazon Creek Fossils
←	End of Romer's Gap
←	Start of Romer's Gap
	Subdivision of the Carboniferous according to the ICS, as of 2021.; 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	FAD of the Fusulinid Protriticites or 1 million years older Montiparus montiparus
Lower boundary GSSP candidate section(s)	Southern Ural mountains; Southwest USA; Nashui, Luodian County, Guizhou, China;
Upper boundary definition	Not formally defined
Upper boundary definition candidates	FAD of the Conodont Idiognathodus simulator
Upper boundary GSSP candidate section(s)	Southern Ural mountains; Nashui, Luodian County, Guizhou, China;

The Kasimovian is a 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.^[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.

^ "Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.
^ ^a ^b ^c ^d "Global Boundary Stratotype Section and Point". International Commission of Stratigraphy. Retrieved 23 December 2020.
^ Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press.
^ 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)