Geology of Ontario map series, a major OGS initiative

Chief geologist of the province’s Precambrian geology section, A. C. Colvine, says the “Geology of Ontario” project is the most comprehensive initiative currently under way by the OGS.

“This project will synthesize our present knowledge of the geology of the province and reflect the significant advances in our understanding over the last 20 years,” he says.

The project will be carried out in several stages over the next three years, with the goal of producing all material by the centennial of the OGS in 1991. Accompanying the final volume, will be a set of maps, at a scale of 1:1,000,000 (1 inch to 16 miles), covering bedrock geology, tectonics, metallogeny, magnetics, gravity, and quaternary geology.

The bedrock geology map is currently partially completed, and is scheduled for release in 1989, Colvine says. At present the legend is complete for the geology map, and editing of the map prior to submission for printing will be complete by early 1989. The tectonic map will be in manuscript form next year, and the other maps will follow in sequence.

OGS geologist, P. C. Thurston says, “major changes in the shape of the individual greenstone belts, the levels of detail displayed in granitoid areas, and the character and extent of individual geological sub-provinces will make this synthesis a worthwhile update.”

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