The possibility to measure the rates and dates of landscape processes by in situ-produced cosmogenic nuclides (e.g., 10Be and 26Al) is currently leading to an entirely new understanding of the processes that shape the Earth’s surface. We develop the ratio of the meteoric cosmogenic nuclide 10Be to that of stable, lithosphere-derived, 9Be as an innovative tracer of Earth surface processes. We furthermore develop means to use both methods in the youngest geologic past to estimate past erosion rates.
