The shallow section is made up of gravel and fine silty sand with resistivity values ranging from 24 Ohm·m to 232 Ohm·m.The base of this unit reaches a depth of 18 m in VES 8, with a minimum interpreted as 4.6 m in VES 9.It underlies a horizon with resistivity values between 38 and 170 Ohm·m with its deepest base in VES 11, with 43 m. In general, it can be said that the thickness tends to increase to the south.