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When did the Kasimovian Stage occur?
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Carboniferous Period
Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the late Carboniferous Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.
The Kasimovian Stage occurred approximately 307 million to 303.7 million years ago. It is the third of four internationally defined stages within the Pennsylvanian Subsystem of the Carboniferous Period.1