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In choosing which boulders to sample, we recommend
sampling all the tallest boulders on the moraine. If resources
for further sampling are available, additional boulders should
be chosen randomly. All the sampled boulders should be on
the crest of the moraine. The samples from the tall boulders
have a good chance of producing at least one exposure date
that correctly estimates the moraine
ments, Quat. Geochronol., 3, 174
-
195, doi:10.1016/j.quageo.
2007.12.001.
Barrows, T. T., S. J. Lehman, L. K. Fi
eld, and P. de Deckker
(2007), Absence of cooling in New Zealand and the adjacent
ocean during the Younger Dryas chronozone, Science, 318,86
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89, doi:10.1126/science.1145873.
Barrows, T. T., S. J. Lehman, L. K. Fi
eld, and P. de Deckker
s age, assuming inheri-
tance is not important. The randomly chosen samples will
help identify the source of any geomorphic bias, if the
exposure dates from the tall boulders are widely scattered.
Moreover, the surface relief of sampled boulders should be
recorded in the
'
(2008), Response to comment on
Absence of cooling in New
Zealand and the adjacent ocean during the Younger Dryas chron-
ozone,
“
Science, 320, 746edoi:10.1126/science.1152216.
Benson, L., R. Madole, G. Landis, and J. Gosse (2005), New data
for Late Pleistocene Pinedale alpine glaciation from southwestern
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”
field and given in papers that report new
-
65, doi:10.1016/j.quascirev.
exposure dates.
2004.07.018.
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Acknowledgments. This work was partly supported by the Na-
tional Science Foundation (grants 0531211, 0539578, and
0424589), the Comer Science and Education Foundation, and the
Geological Society of America (grant 8736-08). Discussions with
Tom Lowell, David Pollard, Kaitlin Walsh, Fred Phillips, Meredith
Kelly, Aaron Putnam, Roseanne Schwartz, and Ed Evenson sharp-
ened our thinking on these issues. Comments from two anonymous
researchers also improved the manuscript.
13,896.
Briner, J. P. (2009), Moraine pebbles and boulders yield indistin-
guishable
10
Be ages: A case study from Colorado, USA, Quat.
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305, doi:10.1016/j.quageo.2009.02.010.
Briner, J. P., D. S. Kaufman, W. F. Manley, R. C. Finkel, and M. W.
Caffee (2005), Cosmogenic exposure dating of late Pleistocene
moraine stabilization in Alaska, Geol. Soc. Am. Bull., 117, 1108
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