Abstract
Cosmogenic [ 26Al] and [ 10Be] depth profiles can be used to date river terrace sediments over million-year timescales, provided that production rates are well constrained with depth. Production by nucleon spallation, negative muon capture, and fast muon reactions can be approximated as exponential functions of depth, up to ∼5000 g cm −2. These production rates are used to date a ∼10 m profile of eroded terrace sediments to 1.50 +0.32/ −0.25 Ma. The measured [ 10Be] profile and the terrace age agree well with expectations, demonstrating feasibility of the technique.
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