Beryllium 10 cosmogenic dating
When it reaches the terminus of the glacier, the boulder will be deposited.
Different isotopes are used for different lengths of times.
AA(Department of Geology, University of Cincinnati, Cincinnati, Ohio, USA), AB(School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA), AC(Department of Geological Sciences, California State University, Fullerton, California, USA), AD(Department of Geology, University of Cincinnati, Cincinnati, Ohio, USA), AE(Department of Earth and Planetary Science Department, University of California, Berkeley, Berkeley, CA 94720-4767, USA), AF(Department of Earth Sciences, University of Southern California, Los Angeles, California, USA), AG(Department of Geological Sciences, Central Washington University, Ellensburg, Washington, USA)Be TCN inheritance within cobbles and boulders.
This suggests that the predominantly bedrock hillslopes erode very slowly and sediment is transferred very gradually in most regions within Death Valley.
Attenuation of cosmic rays Bethan Davies sampling a boulder for cosmogenic nuclide dating in Greenland.
Sampling and dating boulders in a transect down a mountain will rapidly establish how thick your ice sheet was and how quickly it thinned during deglaciation.