On large-scale tectonic structures in the Agder-Rogaland region, southern Norway

It is proposed that the shape of the southern tip of Norway is controlled by a complex megatectonic Precambrian fold (synclinorium) with N-S axis and fold closures situated along the present coastline. Lithologic units of metasediments, such as calc-silicate rocks (skarns) can be linked together by the proposed interpretation, and even isolated areas of granulite facies rocks stretching east-west may be tied up. It is suggested that an older fold belt (geosyncline) ran east-west, and was situated near the present coast of Agder-Rogaland in southern Norway. Faulting connected to the older structures occurred in late- and post-Precambrian time, and facilitated the erosional work of the Pleistocene glaciers by accentuating the relief of the southernmost tip of Norway.