The data set includes the geographic position and elevation of the analyzed samples and the obtained apatite fission track ages. ρs (ρi) is the spontaneous (induced) track density (105 tracks/cm2); Ns (Ni) is the number of counted spontaneous (induced) tracks; ρd is the dosimeter track density (105 tracks/cm2); Nd is the number of tracks counted on the dosimeter; P(χ2) is the probability of obtaining Chi-square value (χ2) for n degrees of freedom (where n is the number of crystals minus 1); ages were calculated using the zeta calibration method (Hurford and Green, 1983), glass dosimeter IRMM540, and zeta values of 226±13 a/cm2 determined with the Durango apatite standard.