pressures may have occurred. Moreover, samples from the hanging wall collected in close proximity to the fault plane show no evidence for heating during progressive burial of sediments. This absence of evidence for heating during faulting is indicative of low frictional stress and therefore, low rates of slip. This shows solid agreement with the evolution of the Canadian Rocky mountain foreland thrust and fold belt, including the Lewis thrust sheet which has been interpreted to have developed and commenced movement in pulses. References Landforms of Glacier National Park (U.S.) Landforms of Montana Geography of Montana Geology of Montana