Glacial tectonic and flow structures in glaciogenic deposits: a cautionary note

Abstract

Large scale displacement and deformation of bedrock and associated glacial deposits can be produced by both glacial tectonics and debris flows. Large scale deformation of glacial deposits not associated with dis­placement of underlying strata can be produced by both glacial tectonics and ice-contact processes. Smaller scale structures such as boudins, stringers of sand and silt and laminated diamictons can be pro­duced by both glacial tectonics and flow processes. Examples of both large and small scale structures produced by flow are presented to emphasize the need for adequate criteria to determine the origin of these structures.