Fig. 4

a NE-face of point 3030. Low ground: Light-gray foliated meta-gabbro of the ZSU with well-preserved omphacite. Top part of wall: Rusty-weathering Grt-Ph schists (sampling site of KB860 and OK-Z133) and Bt-gneiss (Fig. 3). The basal thrust of the Theodul Glacier Unit in the middle of the wall and is well marked with small serpentinite lenses (e.g. at the position of the two geologists in white circles). b Point 3002 seen from north (Figs. 2 and 3). Basal thrust of TGU marked with red dashed line (ZSU above the lake, TGU at the top). Along the thrust several small serpentinite lenses occur. Rusty TGU rocks are predominantly Grt-mica-schists. Eclogites and Bt-gneiss are greyish colored. c Garnet-phengite schist at outcrop scale. Note cm sized and euhedral undeformed garnet (hammer head is 12 cm). d Close-up of framed area on c