FIG. 9. Ground penetrating radar profile corresponding to the west–east section of Grid C perpendicular to the time domain reflectometry probes of the measurement well. Radar surfaces linked to depositional units are outlined. Four units are characterized: Unit 5, palaeochannel; Unit 6, progradation of an alternation of sand and gravel mixture Gcm,b and matrix-free gravel Gcg,o; Unit 7, trough fill; Unit 8, high-energy deposit.