Lepontin dome
Bündner schist | flysch | molasse
Aarmassif | Dent Blanche klippe | Engadine window | Flysch zone | Giudicárie line | Greywacke zone | Hohe Tauern window | Molasse basin | Penninic thrustfront | Periadriatic Seam | Ivrea zone | Lepontin dome | Rechnitz window | Rhône-Simplon line | Sesia unit
The Lepontine dome or Lepontin dome is a region of tectonic uplift in the Swiss part of the Alps. It is located in the Lepontine Alps and Glarus Alps.
The Alps north of the Periadriatic Seam are usually divided into three large nappe complexes. From bottom to top these are the Helvetic, Penninic and Austroalpine nappes. East of the dome all three are found on top of each other. The same counts for the region west of the dome, if the Sesia unit is seen as part of the Austroalpine nappes. The dome itself however only shows Penninic and Helvetic (the boundary between the two is still disputed) rocks. Apparently the uplift of the dome caused the upper Austroalpine material to be totally eroded away.
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Wikipedia