This paper is concerned with the origin of the complex structures forming the narrow disturbed

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belt extending some 1,100 miles along the eastern edge of the Rocky Mountain system in Canada. Consideration is given to the general structural pattern of the belt with emphasis on the major arcuate trends and on the variations in structural character from one region to another. Possible causes of the structural pattern are sought in the relationship of the margin of the pre-Cambrian shield to the Rocky Mountain geosyncline; in facies changes in the Paleozoic and Mesozoic sedimentary section and in the intrusions of Cretaceous and Tertiary batholithic bodies in eastern British Columbia.

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