Numerical simulations are useful where field evidence is impossible, as in astronomy. In geomorphology numerical simulations are also used, but a model's assumptions can be verified with field evidence. MacGregor et al. (2000) present six assumptions that follow Davis' (1906) glacial-landscape evolution model. Matthes (1898–1935) applied this to Yosemite Valley, then Bryan (1932) used Matthes' work (1930) to defend Davis, whose views were being criticized (Chorley, 1973). Here we analyze these six assumptions.

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First, glaciers broaden valley bottoms; second, this action changes a valley's cross-profile from V- to U-shaped. Bateman and Wahrhaftig (1966) noted that glaciated canyons...

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