Deutsch: Isorno-Bellinzona-Komplex
Français: Complexe d'Isorno-Bellinzona
Italiano: Complesso di Isorno-Bellinzona
English: Isorno-Bellinzona Complex
The Bosco, Bombogno, Isorno and Orselina-Bellinzona zones (informally grouped into this complex) include various rocks (micaschists, para- and orthogneisses, calcschists, marbles, amphibolites and few ultramafics), probably Paleozoic and Mesozoic in age, which can locally be interpreted as a mélange. The Bosco and the Bombogno zones appear between the Antigorio and Monte Leone nappes in the large polyphase Alpe Bosa-Wandfluhhorn Fold located between the Maggia and Antigorio valleys. In the southern part of the eastern (upper) limb of this fold, these two units have not been distinguished and are grouped together in the Isorno Zone.
Bosco-Isorno-Orselina zone (Steck 2008), Bosco, Bombogno, Isorno and Orselina-Bellinzona zones (Gouffon et al. 2024)