Devonian and Early Carboniferous Laurussia
With the late Caledonian suturing of Laurentia-Greenland and Fennosarmatia-Baltic along the Arctic-North Atlantic Caledonides, the Laurussian megacontinent was formed. This large cratonic block remained intact for some 350 Ma until its break-up along the Arctic-North Atlantic Caledonian megasuture during the earliest Eocene.
Following the latest Silurian-earliest Devonian consolidation of the Arctic-North Atlantic Caledonides, the lapetus subduction system became inactive. This entailed a fundamental plate reorganization.