258043.fig.007a
(a)
258043.fig.007b
(b)
258043.fig.007c
(c)
258043.fig.007d
(d)
258043.fig.007e
(e)
258043.fig.007f
(f)
Figure 7: Seismic refraction profiles ((a), (c) and (e)) detect three layers, the first two (A1 and A2) related to Unit A and the third to Unit B drilled by boreholes; LV indicates low-velocity zones. Electrical resistivity tomography profiles ((b), (d) and (f)) detect four layers, the first two related to Unit A, the third to Unit B, and the fourth (C) to a non drilled shale layer. LD indicates lateral discontinuity of marl formation. Profile locations appear in Figure 5.