They characteristically form by the accumulation of snow and ice avalanching from upslope areas. When a valley fills with a glacier, any land which is in the way of the moving glacier will be eroded away. Source: Steven Earle (2015) view source. The term faceted spur is also applied to inverted-V rock faces formed by stream, wave, or glacial erosion and, thus, as a synonym for truncated spur. As the valley glacier moves, abrasion and plucking erode the protruding tips of the spurs, leaving steep cliff-like truncated spurs. //
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