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When did the boundary between the Mississippian and Pennsylvanian subperiods 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 boundary between the Mississippian and Pennsylvanian subperiods occurred approximately 323.2 million years ago.1