Sixth stage of the Carboniferous
| Kasimovian |
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−360 — – −355 — – −350 — – −345 — – −340 — – −335 — – −330 — – −325 — – −320 — – −315 — – −310 — – −305 — – −300 — – | | | Subdivision of the Carboniferous according to the ICS, as of 2023.[1]Vertical axis scale: Millions of years ago |
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| Name formality | Formal |
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| Celestial body | Earth |
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| Regional usage | Global (ICS) |
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| Time scale(s) used | ICS Time Scale |
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| Chronological unit | Age |
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| Stratigraphic unit | Stage |
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| Time span formality | Formal |
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| Lower boundary definition | Not formally defined |
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| Lower boundary definition candidates | FAD of the Fusulinid Protriticites or 1 million years older Montiparus montiparus[2] |
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| Lower boundary GSSP candidate section(s) |
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| Upper boundary definition | Not formally defined |
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| Upper boundary definition candidates | FAD of the Conodont Idiognathodus simulator[2] |
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| Upper boundary GSSP candidate section(s) |
- Southern Ural mountains[2]
- Nashui, Luodian County, Guizhou, China
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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.