Igneous rocks belonging to the Rogaland Anorthosite Province were intruded into gneisses of the Sveconorwegian orogenic belt in southern Norway. The province comprises three major anorthosite massifs (Egersund-Ogna, Åna Sira and Håland-Helleren), Western Europe’s largest layered intrusion (Bjerkreim-Sokndal), two smaller anorthosite-bodies, several broadly mangerite (=hypersthene monzonite) intrusions, charnockites, and many minor intrusions of Jotunite (=hypersthene monzonorite). The igneous activity took place over a surprisingly short period of time at a depth of approximately 16-20 kilometres. Contact metamorphism influenced gneisses that had previously reached granulite facies regional metamorphism and produced very high temperature mineral assemblages in the inner aureole. There is a long history of exploitation of iron-titanium ores in the province and it contains the largest active titanium mine in Europe at Tellenes.
The Rogaland Anorthosite Province forms the most important part of the Magma Geopark. The landscapes here are unique with bare, rounded, rocky outcrops stretching for as far as the eye can see. The mining history can be studied in several locations, including Blåfjell (titanium), Gursli (molybdenum) and Ørsdalen (tungsten and molybdenum). The landscape was strongly influenced by the Ice Age and many glacial features are well preserved, including chatter marks, glacial striations, perched erratic’s, end moraines, an esker (the superbly exposed St. Olav´s Orm), and many rocks falls (including the huge block field in Gloppedal).