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The Mythen is an isolated thrust outlier (Klippe) of Mesozoic rocks lying on top of Tertiary Eocene flysch, which in turn covers other Mesozoic formations. It is believed that the Mythen has been transported almost 150 km (90 miles) from the south.
The steep sides of Mount Pilatus, south of Lucerne, are seen on the left. The rocks are mostly Cretaceous sediments.
View to the west (left) near the top of Mount Pilatus, south of Lucerne. Note the very contorted layers. The mountain was overthrust about 50 km from the south (left of picture).
View to the east from Col de la Croix. Parts of four stacked nappes are visible from this point: Niesen, Bex, Diablerets and Wildhorn.
View of the Dents de Morcles, near Mex. The arrow at the right indicates where the Morcles Nappe (above the arrow) slid over the more fixed layers below. Here the layers of the Morcles Nappe are reversed, due to recumbent folding from the south (right). The arrow at the left, which is within the Morcles Nappe, points to the lower margin of the thin, dark Gault (Upper Cretaceous) layer. Just below is a thick Nummulitic limestone layer (Eocene). Standard geologic interpretations would suggest some 45 million years between these two layers; yet the thin Gault shows little evidence of any erosion for 45 million years (remember the Morcles layers are overturned here).
Panorama from Gornergrat looking towards the west. The peak on the left is the Matterhorn; the next peak is Dent Blanche. Both peaks are part of the Dent Blanche Nappe. The peak on the far right is Weisshorn.