headwall

When a landslide gives way, it leaves a steep vertical face, or headwall, at the top of its scar. (The toe slope is the face of the rubble field at the bottom of the slide where the failed material settles.) Headwall also applies to the wall at the back of a glacial cirque. Mountain climbers often seek out headwalls because of the challenge of their steepness. The Coleman Headwall, above the Coleman Glacier on Mount Baker, Washington, is such a place.

William deBuys