The development of a Gneiss zone in the Flin Flon area

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Ruttan, George Douglas
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The Flin Flon Map area roughly occupies a rectangle of about two hundred square miles, with the mining town of Flin Flon occupying a central position. It is bounded on the West by the second meridian, which is marked by the monumented survey line, running due North and South... The work in the field was carried out plotting the data directly on serial photographs, taken at ten thousand feet. Flights were made east and west, with a good overlap both within and between flights. In the flight covering the area just north of Willow Creek, a gap was left from the Meridian east, for about twenty-five hundred feet. Here, the outcrops were sketched in by pace and compass traverses tying to the flight immediately south, and the flight to the north of the gap. The topography is typical of the Pre-Cambrian in this part of the country with a relief rarely exceeding fifty feet. Willow creek follows a large, somewhat swampy valley which is probably of structural origin. Another area of swamp lies just north of the intrusive, paralleling the regional trend of the structure. The outcrops are somewhat scattered, and generally low lying, elongated in the direction of regional strike. Breaks in the outcrops may be caused by local structures, but in the main are due to changes in lithology. Discontinuities along the strike are often caused by a fingering out of the relatively hard silicified material. The outcrops in the sediments are more scattered than elsewhere, many of them being quite small. This is due largely to the incompetent nature of the sediment, which is more easily eroded. Larger, more closely grouped outcrops are found in the zones of hard silicified tuffs and gneiss.