Extension of Trollheimen tectono-stratigraphic sequence in deep synclines near Molde and Brattvag, Western Gneiss region, southern Norway

A 70 km-long belt along Moldefjord contains a well-defined sequence of Caledonide thrust nappes infolded into Baltica basement, corresponding exactly to the sequence in the Surnadal syncline and Trollheimen, from base to top, the Risberget, Saetra, Blaho-Surna, and Storen Nappes. Quartzites in areas of basement may correspond to Amotsdale Quartzite tectonically sandwiched with basement in Trollheimen. The metamorphic discontinuity, previously described in the Surnadal area persists through the area. All levels are pervaded by subhorizontal lineation parallel to fold axes. Lineation is related to sinistral shear features and sheath and tubular folds superimposed on earlier structural features and indicating a phase of late Scandian sinistral shear under low amphibolite conditions parallel to the length of the orogen. -from Author