truncate spur

A periglacial spur whose tip or leading edge has been planed off by glacial erosion is known as a truncated spur. Due to the depth of the valley formed by the spur’s parent mountains, the glacier was forced to go through, rather than over or around, the spur, summarily “truncating” it. The consequent bluff or blunt slope can be both visually stunning and quite dangerous. Striking examples of truncated spurs are found in Yosemite and Glacier National Parks.

Stephen Graham Jones