The Simano Nappe is a tectonic unit of the Eastern Lepontic (Ticino Culmination). It consists of a heterogenous metamorphosed magmatic complex intruded into pre-Variscan paragneisses, forming today the orthogneisses that dominate the southern and the western part of the nappe. The eastern part contains Ordovician orthogneisses within paragneisses and the northern part consists of semi- to metapelitic gneisses, micaschists, amphibolites and sporadic lenses of ultramafic rocks, locally covered by Permian and Triassic sedimentary rocks. The frontal part of the Simano Nappe, forming  a large-scale recumbent fold, is bordered by metacarbonates, considered to be the Mesozoic sedimentary cover of the nappe.

Copertura sedimentaria normale del cristallino antico del Campo Tencia

Weiss und bläulich-grau gebänderte Dolomite der "nordpenninische" Trias.

Gneiss oligoclasico chiaro a due miche, con microclino, a grana media, con grande lamine di miche.

Meist stark verschieferten, quarzreichen augigen Zweiglimmer-Alkalifeldspatgneis mit makroskopisch auffallenden blaugrauen Feldspäte.