Darryl E. Granger, James W. Kirchner, Robert C. Finkel; Quaternary downcutting rate of the New River, Virginia, measured from differential decay of cosmogenic 26Al and 10Be in cave-deposited alluvium. Geology ; 25 (2): 107–110. doi: https://doi.org/10.1130/0091-7613(1997)025<0107:QDROTN>2.3.CO;2
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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.