Deutsch: Säntis-Decke
Français: Nappe du Säntis
Italiano: Falda del Säntis
English: Säntis Nappe
The Säntis Nappe is an Upper Helvetic tectonic nappe of the Eastern Swiss Alps, extending from the Linth Valley in the west to the Rhine Valley in the east (including the Fläscher Berg east of Sargans). It overlies the Glarus Nappe Complex north of the Walensee and Seeztal, forming a broad synform, in the core of which are preserved klippen consisting of Upper Helvetic mélanges, as well as Lower and Middle Penninic units.
The Säntis Nappe is composed of Cretaceous and rare Paleogene sediments. Its internal structure is characterized by fold trains and fold-parallel thrust faults, with an important N–S oriented fault between Sax and Appenzell (Sax-Schwende Fault) that can be shown to have been active during the nappe internal deformation.
Säntis (AI)/(AR)/(SG) im Alpstein
Säntis-Teildecke (Schmidt & Preiswerk 1908), Nappe du Sentis (Boussac 1912), nappe du Säntis-Churfristen (Trümpy 1970), Churfristen-Säntis-Decke (Bayer 1982), Säntis Nappe (Gouffon et al. 2024)