Kasimovian
Geologic period
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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, lasting from 307 to 303.7 Ma. The Kasimovian Stage follows the Moscovian and is followed by the... Wikipedia
Occurred: 307 (+/- 0.1) million years ago - 303.7 (+/- 0.1) million years ago
Epoch: Pennsylvanian
Lower boundary definition: Not formally defined
Lower boundary GSSP candidate section(s): Southern Ural mountains; Southwest USA; Nashui, Luodian County, Guizhou, China
Upper boundary definition candidates: FAD of the Conodont Idiognathodus simulator