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How did Pangea form by the end of the Paleozoic Era?

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The formation of the supercontinent Pangea was a gradual process driven by plate tectonics, occurring through the collision of major paleocontinents over millions of years.12

The assembly began well before the end of the Paleozoic Era. During the Devonian Period, the landmasses of Laurentia and Baltica fused with various microcontinents to form Euramerica (also known as Laurussia).23

By the beginning of the Permian Period, the northwestern coastline of the southern supercontinent Gondwana collided with the southern margin of Euramerica, triggering significant mountain-building events such as the Alleghenian orogeny in North America and the Hercynian orogeny in Europe. The final assembly of Pangea was completed by the middle of the Early Permian Epoch when the Angaran craton of Siberia fused to the combined landmass during the Uralian orogeny. By the end of the Paleozoic, Pangea existed as a single, C-shaped supercontinent surrounded by the global ocean Panthalassa.234