Geology and economic minerals of Canada. Part A (chapters I-VII) / Геология и экономика полезных ископаемых Канады

Since the fourth edition of Geology and Economic Minerals of Canada was published in 1957 our knowledge of the geology of Canada has increased greatly. Heretofore, geological information was meagre for many parts of the country, although detailed but isolated information was available for the mineral producing areas and more accessible regions. A large part of the new knowledge has been gained in the course of systematic geological mapping; by 1957 nearly 75 per cent of Canada was still unmapped geologically whereas in 1968 only 15 per cent remained unmapped at reconnaissance scales. The important element of continuity has been established by the initial mapping, so that it is now possible to assess and present a broad range of data in both geological and tectonic terms of reference. Of the total geological research in Canada, however, only a part has been directed towards the regional type of investigation; continuing studies have been made of many matters of economic and scientific interest, not only by the Geological Survey of Canada but also by provincial organizations, the mining and petroleum industries, consultants, and the universities (see Appendix). <...>