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When did the Eifelian Stage occur?
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Devonian Period
Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the early Devonian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.
The Eifelian Stage, which serves as the lowermost division of the Middle Devonian Series, occurred between 393.3 million and 387.7 million years ago.1