Field evidence in Saskatchewan indicates that glaciotectonic processes result in a significant change in the shear strength properties of the sediments and the boundary conditions for the groundwater regime. Glacier ice-thrusting resulting in the deformation and shearing of bedrock and glacial sediments appears to be widespread throughout southern Saskatchewan and probably elsewhere where continental glaciers overran clay shale or weakly cemented bedrock. Theoretical considerations indicate that wherever a glacier is forced into compressive flow by physical features that tend to decrease flow downstream, shearing thrust planes develop in the ice causing brecciation, slickensides, overthrust faulting, and drag folding of sediments that have been carried up into the ice. The conditions required to produce this phenomenon include upslope movement of the glacier over a concave surface and net ablation in the glacier regime. Three examples of the engineering implications of this process are included where massive landslides were found and it was established that ice-thrusting had occurred. Criteria were then established that would enable geotechnical engineers to identify the presence of this phenomenon during site investigations.