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Abstract

Aeromagnetic surveying by Canadian government agencies commenced in 1947, and by 1967 a sufficient area of the country had been covered so that it was feasible to produce a Magnetic Anomaly Map (MAM) of Canada. The first 1:5 000 000-scale national MAM was published by the Geological Survey of Canada in 1967, subsequent versions were published in 1972 and 1977, and a fourth edition has been compiled. The colored Magnetic Anomaly Map of Canada demonstrated that features of large areal extent, such as geologic provinces, were readily delineated and proved the usefulness of producing such regional compilations. Consequently, in carrying out aeromagnetic surveys overseas as contributions to Canadian aid programs, the preparation of regional magnetic-anomaly maps has usually been made part of the contract at the interpretation stage. The first such MAM published under contract was a colored 1:1 000 000 MAM of Guyana, which was the first of its kind in South America. Subsequently a colored 1:1 000 000 MAM of Baluchistan, Pakistan, was published, and a MAM for the Liptako-Gourma area of West Africa is being prepared. It is abundantly clear that such magnetic-anomaly maps should be made a standard end product of regional aeromagnetic sur-veys because of their several uses. They serve not only as index maps to the aeromagnetic-survey coverage available on a national basis (as well as to gaps in the coverage) but also stimulate comparison of the regional magnetic features with those appearing on similar-scale geologic and geophysical (e.g., gravity) maps and with Land sat imagery. They also make excellent office wall displays for hand-waving geo-physicists.

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