The Foothills of the Western Canadian Sedimentary Basin (WCSB) cover 40 000 miles2 in the fold and thrust belt of the Canadian Rocky Mountains. The topmost northwestern point lies just north of the Northwest Territories border at the town of Fort Liard. The Foothills also occupy part of the adjacent Yukon Territory, run southeast through British Columbia and Alberta, and terminate near the U.S./Canadian border (Figure 1).

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The northwestern and southeastern limits are controlled by political boundaries and the extent of the natural gas gathering system. The width is defined on more geologic grounds. The Triangle Zone...

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