Dating of a terrace. Given the ¹⁰Be concentrations in table below, and assuming sediment bulk density r = 2100 kg/m³, characteristic attenuation length [fast neutrons] L = 1600 kg/m², 

i) Determine the best fitting shifted exponential profile. 

ii) Calculate the age of the surface, assuming that the local production rate P_o = 30 at/gm qtz, and ignoring decay. 

iii) Using the inheritance determined from the shift in the profile, calculate the basin-averaged erosion rate, assuming the same production rate.

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10Be concentration Depth (m) (atoms/g) 0 0.5 0.9 1.3 1.7 4.05 x 105 2.43 x 105 1.66 x 105 9.81 x 104 4.81 x 104 26 Al concentration (atoms/g) 2.43 x 106 1.47 x 106 1.05 x 106 5.97 x 105 3.06 x 105