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The Canadian sector of the Cordilleran Orogen encompasses an area of over 1.6 x 106 km2 and extends from the base of the continental slope on the west to the western limit of undeformed strata underlying the Interior Plains. Its northern boundary is the Beaufort Sea and its southern boundary, 2000 km to the south, is the International Boundary, for the most part at 49°N (Map 1701 A, in pocket).

The great diversity in the geology of the region is reflected in its varied physiography. Spectacular exposures of layered sedimentary strata characterize the British, Richardson, Ogilvie, Wernecke, Mackenzie and Rocky mountains of the Foreland Belt in the eastern part of the Cordillera. To the west equivalent rocks have been intensely folded, metamorphosed and intruded by granitic rocks to form the rugged Selwyn, Kaska and Columbia mountains of the Omineca Belt (Morphogeological Belt map - inside front cover). Transecting the Omineca Belt in the Yukon Territory and separating the Foreland and Omineca belts in British Columbia is one of the world's most remarkable lineaments represented by the Tintina, Northern Rocky Mountain and Southern Rocky Mountain trenches. The straight valleys of the Tintina and Northern Rocky Mountain trenches coincide with the traces of dextral transcurrent faults, whereas the three arc-like segments of the Southern Rocky Mountain Trench, although everywhere associated with faults, are not known to be the loci of transcurrent displacements.

The Intermontane Belt of central British Columbia and south-central Yukon Territory is underlain by a wide variety of

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