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The Permian-Triassic Boundary and its Relation to the Paleophyte-Mesophyte Floral Boundary
The floral change from Paleophyte to Mesophyte in Western Europe and Cathaysia is usually equated with the Lower-Upper Permian boundary and in other parts of the world with the Permian-Triassic boundary. The latest data on floras of the Upper Permian and Lower Triassic of the Russian Platform, Siberia, India and other regions show that the change occurs in different parts of the Northern Hemisphere at various horizons within the Upper Permian and in Gondwanaland within the Lower Triassic. The asynchronous character of this change in different parts of the world, as well as the increasing unity of floras in the Lower Triassic as compared to the Upper Permian, suggests that paleogeographic changes were the cause of this event. Such rearrangements of paleogeographic barriers must have occurred at several times near the Permian-Triassic boundary.
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