Fig. 4From: The Glarus Double Fold: a serious scientific advance in mid nineteenth century Alpine GeologyTheoretical scheme of mountain building due to an uprising mass of metamorphic rocks, according to Studer (from Studer 1847: 183). The sedimentary cover immediately overlying the metamorphic core of the mountain range is supposed to have been dragged towards the central vent or fissure, causing folding as indicatedBack to article page