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When did the Gzhelian 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 Gzhelian Stage occurred from 303.7 million to 298.9 million years ago. It represents the final stage of the Pennsylvanian Subsystem within the Carboniferous Period.12