Once the main phase of deformation of the orogeny was over basins that had formed in-between metamorphic rock massifs were filled by sedimentary rock in the Devonian and Carboniferous periods. During and after sedimentation large granitic plutons intruded the crust. Viewed in a map today these plutons make up about 15% the Sudetes. Granites are of S-type. The granites and grantic-gneisses of Izera in the west Sudetes are disassociated from orogeny and thought to have formed during rifting along a passive continental margin. The Karkonosze Granite, also in the west Sudetes, have been dated to have formed "c". 318 million years ago at the beginning of the Variscan orogeny. The Karkonosze Granite is intruded by somewhat younger lamprophyre dykes.