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Earth's dynamic surface undergoes a continuous cycle of mountain building and denudation. One of the important links in this cycle is the break-up and comminution of the rocks that allows for effective transportation of debris by surface processes. The starting and end points in this transformation are well known: bedrock and boulders on one end and silt and clay on the other. However, the existing...
Estimates of regolith degradation in the McMurdo Dry Valleys of Antarctica are currently based on indirect evidence and ancient ashes at or near the soil surface that suggest excellent preservation of surfaces. On the other hand, the existing cosmogenic-nuclide surface exposure ages from many parts of the Dry Valleys are younger than the age of surface deposits inferred from stratigraphic relations...
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