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, E-mail address: siame@geol.u-psud.fr (2-?), respectively. The model solution is ideally located within a well-defined potential pit of ? 2 -values

, A -Location of the Bois Clary terrace onto a SPOT image extract centred on the Nîmes fault and the Pujaut basin (modified after Peulvast et al. [8]). B -General view of the surface of the Bois Clary Villafranchian terrace. C -View of the ~2m deep anthropomorphic outcrop where the depth profile has been sampled. A-A' -Sketch geological profile (modified after Peulvast et al. [8]): Fz, low fluvial terraces, Late Glacial to Holocene deposits; Fy, intermediate fluvial terraces, Early Late Glacial fluvial deposits; Fx, high fluvial terraces, Middle Pleistocene or older fluvial deposits, Figure 3 -Structural and geomorphic setting of the Bois Clary alluvial terrace

P. Po, ;. , and P. Marl,

. Corresponding-author and . Tel, , pp.33-34

, Langhian-Tortonian sand and marl; m1, Burdigalian molasse; g1, Upper Eocene-Lower Oligocenesand, marl, and limestone; n4ab: Barremian bioclastic limestone, E-mail address: siame@geol.u-psud.fr m2

, A -Plot of the measured 10 Be concentrations as a function of depth with associated uncertainties. Dotted-line represents the modelled exponential decrease with depth for the best-fit (erosion: 24 m/Myr, time: 1.2 Myr, Qf: 0.72) solution. Bold lines correspond to exponential decreases with depth for infinite exposure time (steady-state equilibrium) with erosion rates of 19 and 27 m/Myr, respectively. B -Plot of the gridded log10(? 2 ) values for an exposure duration ranging from 0 to 5 Myr, Figure 4 -Khi-square best fit for the Villafranchian Bois Clary terrace