Deutsch: Suretta-Decke
Français: Nappe de Suretta
Italiano: Falda di Suretta
English: Suretta Nappe
The Suretta Nappe is a Middle Penninic tectonic unit of eastern Switzerland made up of a Paleozoic basement of para- and orthogneisses intruded by the Permian Rofna Porphyry Complex, which consists of granitoids and effusive-type magmatites. Its Permian–Mesozoic cover, in Briançonnais facies, is largely of Triassic age. Locally the Triassic is overlain by Jurassic breccias. This cover crops out as thin layers; in one instance it follows a Suretta internal thrust fault, in other instances they are infolded into narrow synclines that were subsequently backfolded in the upper limb of the north facing Niemet-Beverin Backfold, whose axial trace runs across the Suretta Nappe.
Surettahorn (GR)
Suretta-Decke (Cornelius 1932), Surettadecke (Wilhelm 1933, Staub 1934, Spillmann 1993), Suretta-Decke (Staub 1946, Schmutz 1976), Falda Suretta (Godenzi 1963), Suretta nappe (Milnes & Schmutz 1978), falda Suretta (Sciesa 1991), nappe de Suretta (Mayerat Demarne 1994), Suretta Nappe (TK500 / Gouffon et al. 2024)
cf. Marquer et al. 1994, Marquer & Peucat 1994