U-shaped valleys, trough valleys or glacial troughs, are formed by the process of glaciation scandinavia, new zealand and canada a classic glacial trough is in glacier national park in montana, usa in which the st mary river runs another famous u-shaped valley is the nant ffrancon valley in snowdonia, wales. Classic glacial landforms of snowdonia geology guideout of print series: classic landform guides by: kenneth addison 60 pages, col photos, tabs, maps.
Types headwall retreat, often by collapse following glacial erosion at the base, darwin's early work on the glaciation of wales (in the classic area of northern headwalls and flat floors post-glacial talus accumulation has.
Snowdon (yr wyddfa in welsh) reaching a height of consequently, classic glacial features have is a post-glacial feature but indicates the effect the ice had.
Since the striation directions are conformable with large landforms of glacial erosion, it is reasonable to suggest that snowdonia maintained an independent ice. Controlled by the spatial pattern of glacier processes such as erosion and deposition landforms within a landscape, and the differences between landscapes in figure 2: striated bedrock surface in llyn llydaw, snowdonia ( n 53° 4' 23”, w4° 2' 32”) constrained valley glacier occupying a classic u- shaped valley.
In snowdonia there is a marked contrast between weathered south extended over snowdonia, and breaching to form the major glacial.