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.

Allochthoner Teil der Sedimentbedeckung der Tambo-Suretta-Decken.