Smooth, crescent-shaped features cut into a flat or sloping rock surface by the action of a glacier. They are typically 1–10 m long and 5–6 m wide. The horns of the crescents point down-glacier. Their origin is unclear; the action of saturated till and of subglacial meltwater have both been invoked. The name is German, its literal meaning being ‘sickle tubs’.
Subjects: Earth Sciences and Geography — Ecology and Conservation.