The Mezzaun Slice crops out southeast of the Engadine Fault around the Piz Mezzaun. It is composed of a Mesozoic sequence considered as part of the Bernina Nappe Complex. This slice is downfaulted by the Late Cretaceous Mezzaun Normal Fault in respect to the domal structure of the Murtiröl Slice (Err Nappe Complex) forming the footwall of this fault. It is overthrust by the Müsella Slice.