U shape profile is typical of canyons and valleys that have been eroded and deepened by alpine or valley glaciers.
Glaciation creates u-shaped b, often known as trough valleys or glacial troughs.
They are particularly typical of glaciation in mountains. In cross-section, they feature a distinctive U shape with steep, straight sides and a flat or rounded bottom (by contrast, valleys carved by rivers tend to be V-shaped in cross-section).
Glaciated valleys are created when a glacier slides down a slope while moving across it, scouring the valley as it goes.
When the ice melts or retreats, the valley is left behind and is frequently covered in small rocks known as glacial till or glacial erratic that were carried by the glacier
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