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When did the Mississippian Subperiod 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 Mississippian Subperiod, which is the first major subdivision of the Carboniferous Period, occurred from 358.9 to 323.2 million years ago.12