Fig. 4

Lithotypes analysed and encountered along the FCC’s current tunnel alignment from small-scale drilled plugs to rock cores and large-scale outcrops. A1–A2 Quaternary glaciogenic deposits, M1–M5 different marls as part of the Molasse Rouge formation, S1–S5 different sandstones as part of the Molasse Rouge formation, S6 sandstone as part of the Siderolithic formation, often referred to as Gompholite, HC hydrocarbon-bearing sandstone in the Molasse Rouge formation, C1-C2 different conglomerates as part of the Molasse Rouge formation, L freshwater limestone as part of the Molasse Rouge formation, G1 sandstone as part of the Siderolithic Formation, AG gypsum layer in the Molasse Rouge formation. See text for detailed descriptions