The upper Tinée valley is highly affected by ductile and brittle deformations and the slope direction is strongly strained by the directions N110°-130° (mylonitic corridors, schistosity, faults) and N010°-030° (faults). The simultaneity of the two directions shapes valley sides into triangular facets.
The photo below displays a three dimension view of the facets on the left bank of the Tinée River (source: GoogleEarth). The slopes show a ’triangular facets’ geometry controlled by the structural discontinuities N110°-130° (general direction of the valley) and N010°-030° (secondary valleys).
3D view of the Tinée River left bank