Abstract

The concentrations of the cosmogenic radionuclides 26Al and 10Be in quartz can be used to date sediment burial. Here we use 26Al and 10Be in cave-deposited river sediment to infer the time of sediment emplacement. Sediment burial dates from a vertical sequence of caves along the New River constrain its Quaternary downcutting rate to 27.3 ± 4.5 m/m.y. and may provide evidence of regional tectonic tilt.

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