Snow, Ice, Avalanches, and Glaciers - Mountain Geography: Physical and Human Dimensions - page 201

upland surface has been overrun by ice so that both upland and valley are generally
smoothed by the ice. The Scottish Highlands and the Presidential Range in New Hamp-
shire are examples (Goldthwait 1970). Features of deposition, moraines and glaciofluvi-
al debris are largely restricted to the lower elevations, and generally mark the point of
maximum extent of the ice or places where the glacier remained for the longest periods,
or where it re-advanced slightly as it receded.
FIGURE 4.40 Generalized areas of mountain glaciation in the western coterminous United States. The
southern extent of the Laurentide continental ice sheet is also shown. (Adapted from Flint 1971:
475.)
FEATURES RESULTING FROM GLACIAL EROSION
The growth and decline of mountain glaciers leads to a predictable pattern of landform
development (Fig. 4.41).Up on initial accumulation, the snow and ice adapt to the preex-
isting topography. If the snow accumulation is sufficient, the mountains may be totally