Glaciotectonic deformation structures are useful directional indicators of ice movement but are rarely reported by North American authors. Being three-dimensional, they are commonly conspicuous in cleaned sections. Measuring just a few of them can provide accurate ice-movement directions at a site, and they assist in deciphering the interaction of past glaciers and their substrata. This paper concentrates on structures (generally less than 10 m long) in unconsolidated sediments that were induced by overriding glacial ice. Examples and interpretations of various types of structures are presented in four new Canadian case studies from British Columbia and southern Ontario that illustrate different deformational circumstances in sediments of various ages.

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