Geological investigations in the Byglandsfjorden-Gyvatn area. (The Precambrian rocks of the Telemark area in South Central Norway no. IX).
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The area consists of Precambrian migmatic gneisses in which a group of banded gneisses (migmatic gneisses, sensu stricto) and a group of granite gneisses have been distinguished. Two stages of folding are readily distinguished, and it is possible to find some traces of an even older structure (F1). The F1 structures were refolded by a system of NW-SE folds (F2) and later by a system of E-W folds (F3). The second period of folding produced the most prominent structures, while the third episode is only of minor importance.