Cinematic 4K. Scree is a collection of broken rock fragments at the base of crags, mountain cliffs, volcanoes or valley shoulders that has accumulated through periodic rockfall from adjacent cliff faces. Landforms associated with these materials are often called talus deposits. Talus deposits typically have a concave upwards form, while the maximum inclination corresponds to the angle of repose of the mean debris size. Aerial mountain slope hill hilly highland brown grey mount peak summit mountaineering semiarid arid erosion rocky rock stone stones best blue sky mountain back passage pass top ridge 3840×2160 UHD 4K.