258043.fig.008a
(a)
258043.fig.008b
(b)
Figure 8: (a) Seismic refraction profile detects two layers of Unit A and the top of Unit B; LV indicates a low-velocity zone. (b) Electrical resistivity tomography profile detects Units A and B and a non drilled shale layer. LD indicates lateral discontinuity of marl formation. Profile locations appear in Figure 5.