How did the Angaran craton of Siberia complete Pangea’s assembly?

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Permian paleogeography — Pangea Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins near the end of the Permian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.

The assembly of the supercontinent Pangea was finalized during the middle of the Early Permian Period through the fusion of the Angaran craton of Siberia to the combined landmass of Euramerica and Gondwana.1

Prior to this final stage, the Angaran platform had served as a stable continental nucleus. Throughout the Paleozoic, various island arcs and microcontinents were accreted onto its margins, and the platform eventually collided with the Russian platform along the Ural Mountains during the Carboniferous and Permian periods, a process that contributed to the creation of the supercontinent Laurasia. The ultimate integration of the Angaran craton into the larger Pangean framework marked the completion of the supercontinent's assembly.231