continent.Laurentia and Baltica formed a single continent until 1.265 Ga which broke up some time before 0.99 Ga. After the subsequent closure of the Mirovoi Ocean Laurentia, Baltica and Amazonia remained merged until the opening of the Iapetus Ocean in the Neoproterozoic.

Western margin

The Western Gneiss Region in western Norway is composed of 1650-950 Ma-old gneisses overlain by continental

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