Sarmatia is made up of several once-independent Archaen land masses that developed at 3.7–2.9, 3.2–3.0, and ~2.7 Ga. 2.3–2.1 Ga orogenic belts now separate these land masses. Sarmatia's northwestern margin has an extensive continental magmatic arc dating back to ~2.0 Ga. At ~200 Ma Sarmatia collided with Fennoscandia.
Bogdanova, Svetlana V. (2005) "The East European Craton: Some Aspects of the Proterozoic Evolution in its South-West." Polskie Towarzystwo Mineralogiczne - Prace Specjalne Mineralogical Society of Poland – Special Papers, Zeszyt 26, 2005; Vol. 26. Online: http://www.geo.uw.edu.pl/PTMINSP/2005/018.pdf