Cinematic 4K 50 fps. Curved long valley floor without treeless in autumn. Long and wide U Valley topography from the ice age. U-shaped valleys, trough or glacial troughs, are formed by the process of glaciation. They are characteristic of mountain particular. U shape, with steep, straight sides and a flat or rounded bottom (by contrast carved by rivers tend to be V-shaped in cross-section). Glaciated glacier travels across and down a slope, carving the topographic by the action of scouring. When the ices recedes or thaws remains, often littered with small boulders that were transported within the called till erratic. Gully moraine. High altitude bottom underside base lower part higher elevation terrain treeless hilly alpine meadow autumn tundra geology dehydrated plots waterless barren arid steppe time lapse. UHD 3840X2160.