talus creep
The slow downslope movement of talus, either individual rock fragments or
the mass as a whole.
talus
Rock fragments of any size or shape (usually coarse and angular) derived
from and lying at the base of a cliff or very steep, rocky slope. Also,
the outward sloping and accumulated heap or mass of such loose broken
rock, considered as a unit, and formed chiefly by gravitational falling,
rolling, or sliding.