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Annual collection of reports covering initial data from two NATMAP projects, Ar40-Ar39 results from a project affiliated with the Canada-Alberta Agreement on Mineral Development, recent advances in geochronology of the Cordillera and New Brunswick, and a compilation of results from the Boothia region.
"Two hundred and eight potassium-argon age determinations carried out on Canadian rocks and minerals are reported. Each age determination is accompanied by a description of the rock and mineral concentrate used: brief interpretative comments regarding the geological significance of each age are also provided where possible. The experimental procedures employed are described in brief outline and the constants used in the calculation of ages are listed. Two geological time-scales are reproduced in tabular form for ready reference and an index of all Geological Survey of Canada K-Ar age determinations published in this format has been prepared using NTS quadrangles as the primary reference." --