In Mt Zermula area rocks of Ordovician to Carboniferous age belonging to the Pre-Variscan sequence of the Carnic Alps crop out. The whole area was overturned during the Variscan orogeny and the higher parts of Mt Zermula represent Devonian shallow water rocks thrusted on top of an Upper Ordovician to Lower Carboniferous succession showing mostly basin to slope depositional environments. This distal sequence is well exposed in the southern flank of Mt Zermula and in the eastern and western sides of the study area. The lithostratigraphic units and their relationships are described. A geological map of the southern part of Mt Zermula is provided, as well as a stratigraphic scheme.
