Abstract
An important recent development in the field of geomorphology has been the application ofin-situcosmic-ray-produced nuclides to obtain modelerosion ratesandsurface exposure ages.These concepts emerged some four decades ago in studies of cosmogenic nuclides in meteorites, but cannot generally be used analogously for terrestrial rocks. The differences in the two cases are outlined. For the case ofsteady-state erosional histories, the terrestrialsurface exposure agesdepend on the half-life of the radionuclide studied. A suggestion is made for presenting thesurface exposure ages, which allows a clear definition of the meaning of the estimated exposure ages. In the case of adiscrete exposure history, the meaning of “exposure age”—which should more appropriately be called “event age”—is however quite unambiguous.
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