Parallelism is demonstrated between the arcuate structure of the Mackenzie Mountains and certain elements in the deformed pile of sedimentary rocks, namely: (1) unrestored zero edges of the younger Proterozoic (Windermere equivalent) succession and its constituent formations, and (2) isopachs of three widely spaced formations in the older Proterozoic (Belt-Purcell equivalent) succession.

The data suggest that the configuration of the northeastern flank of the Proterozoic basin(s), established during the Helikian, preordained the arcuate form of the Mackenzie Mountains.

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