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Abstract: The route of the tunnel Subir mainly passes through layers foraminiferal limestones Paleocene - Middle and Upper Eocene (V; Pc-E1,2) and rudist limestone of the upper Cretaceous (V; K2), and it is important to point out the presence of flysch deposits of the Middle and Upper Eocene (F(L); E2,3). Blue-gray layers of flysch marls prevail along with reverse fault in contact with very weathered...