In many spots in the central zone north of the Periadriatic seam large antiforms called anticlinoria can be found, sometimes they are displayed in the outcrops as windows. At the level of one of these windows (the Hohe Tauern window) the Periadriatic seam curves to the north, which suggests that the Adriatic plate is more rigid in this particular spot, working as a so-called indentor. In the central part of Switzerland, uplift took place along a ductile north–south normal faultzone called the Rhône-Simplon line. The structure thus formed is called the Lepontin dome.