The area of Hardangervidda was once part of the Sub-Cambrian peneplain before it was thrusted-over by the nappes of the Caledonian orogeny in Paleozoic times. Much later, in the Miocene epoch, the modern flatness of Hardangervidda took form as a peneplain formed at sea level. Then in Early Pliocene times Hardangervidda and the whole of southern Scandinavian Mountains were uplifted more than thousand meters.