An Experiment in Reconnaissance Mapping

IN recent years, most of the reconnaissance work of the Geological Survey of Canada has been mapped on a scale of 1 inch to 4 miles. Topographic base maps, commonly made from aerial photographs, were available to the geologist for such work. The advent of war curtailed aerial photography for civilian purposes, and by 1941 all areas already photographed had been geologically mapped. Nevertheless, the need for geological maps to assist post-war prospecting was so apparent, and the country to be covered is so vast, that some new method of rapid mapping had to be devised .
Keywords: Air, Eastmain, Eastmain river, Geological and Topographical Surveys, granite, greenstone, pegmatite, Granite, Granites, Mapping, Maps, Operation, Rock, Rocks
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