Terre boule de neige
At c. 555 Ma during the Timanian Orogeny the northern margin became an active margin and Baltica expanded northward with the accretion of a series of continental blocks: the Timan-Pechora Basin, the northernmost Ural Mountains, and the Novaya Zemlya islands. This expansion coincided with the Varanger glaciations, also known as Snowball Earth.