Smøla. Beskrivelse til det berggrunnsgeologiske kart 1321 I - 1:50 000 (med fargetrykt kart).

Abstract

An account is given of the general geology of Smøla and neighbouring islands, with special emphasis laid on the petrology of the various rock-types. The rocks within the map area comprise orthogneisses, paragneisses and migmatites of assumes Precambrian age; Ordovician supracrustal including both a fossili-ferous sedimentary and a volcanic series; and plutonic rocks ranging from ultramafites to granodiorites which are of probable Caledonian age. Major element chemical analyses are presented of 42 intrusive and extrusive igneous rocks. The youngest rocks in the area are represented by Devonian molasse-type conglomerates and sandstones. In the last part of the description some details are given of superficial deposits, mineral occurences and economic geology, as well as an outline of the sequence of structural events from Precambrian to Devonian time.