The Lower Helvetic tectonic subdomain comprises all the sedimentary and crystalline units below the Glarus (eastern Switzerland), Axen (central Switzerland), Diablerets and Wildhorn major thrusts (western Switzerland). It corresponds to the External Crystalline Massifs and what was formerly called the “Infrahelvetic complex” that includes imbricates with North Helvetic facies as well as sedimentary nappes with South Helvetic to Ultrahelvetic facies.
The Neuhausen Fault marks the southwestern boundary of the NW–SE trending extensional Hegau-Bodensee Graben. It is situated in the southeastern extension of the Freiburg-Bonndorf-Bodensee Fault Zone.
The Stelli Slice is a post-nappe tectonic unit (due to a late out-of-sequence thrusting) of the parautochthonous cover of the northeastern end of the Aar Massif.
Stelli-Schuppe (Bl. Vättis), Stelli Slice (Gouffon et al. 2024)