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Science 9 December 2005:
Vol. 310. no. 5754, p. 1581
DOI: 10.1126/science.310.5754.1581e
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This Week in Science

Determining the relative importance of incision by rivers and glaciers in the creation of alpine valleys is often hampered by difficulties in quantifying rates of glacial erosion. Shuster et al. (p. 1668; see the cover) assessed the timing and rate of glacial erosion by 4He/3He thermochronometry. Using an example from the Coast Mountains of British Columbia, Canada, they determined erosion rates both before and during alpine glaciation. The Klinaklini Valley deepened rapidly by 2 kilometers or more around 1.8 million years ago when it became glaciated, at least six times as fast as during its preglacial state.




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