Abstract
The structure of the western part of the Zone of Samedan reflects the interference of Late Paleozoic, Early Mesozoic and polyphase Alpine tectonics. Late Paleozoic transtension is believed to be responsible for the opening of an elongate basin (the Gelgia basin) bounded by steep, ENE-WSW and E-W trending, oblique-slip faults and accompanied by intermediate to basic magmatism. These faults were reactivated during Early Mesozoic rifting, respectively, as NW- to W-dipping oblique, low-angle normal faults and sinistral transform faults. One such transform fault, coinciding with the present Gelgia valley, separated two asymmetrical basins to the north (Bardella and Nair basins) from a relative high to the south (Grevasalvas zone) marked by reduced Mesozoic thicknesses and shallow basins (Dadora and Cotschen basins)
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