Kasimovian | |||||||||||||||
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Chronology | |||||||||||||||
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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[2] | ||||||||||||||
Lower boundary GSSP candidate section(s) |
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Upper boundary definition | Not formally defined | ||||||||||||||
Upper boundary definition candidates | FAD of the Conodont Idiognathodus simulator[2] | ||||||||||||||
Upper boundary GSSP candidate section(s) |
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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.
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