A thin ridge, about a metre high and many metres long, composed of rock fragments, running along the foot of a mountain face and thought to be produced from rock fragments sliding over a snow surface (Curry et al. (2001) Procs. Geols. Ass. 112, 4). Also known as pronival rampart: Margold et al. (2011) Geograf. Series A, 93, 2, 137.