The crustal structure in the Baltic Shield is determined by a system of geological blocks, which formed at different evolutionary stages of this largest stable Precambrian domain. Cratonization of the Archean Karelian, Kola, and Belomorian domains terminated after the Svecofennian orogeny 1.88–1.75 Ga ago. Up to now, the principal structural elements of the shield formed by that time have remained practically unchanged over its entire area.
