Abstract
THE Canadian Shield is a mosaic of structural provinces, each with characteristic internal structural trends and styles of folding1. Boundaries between provinces have been delineated where trends are truncated along unconformities or along orogenic fronts. The validity of this subdivision of the shield has been supported by isotopic dating of orogenies2. Thus, the Superior province is the type region for the Kenoran Orogeny (2,560 Myr BP), and the Churchill and Grenville provinces are the type regions for the Hudsonian (1,800 Myr) and Grenvillian (1,000 Myr) orogenies, respectively.
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GIBB, R., THOMAS, M. Gravity signature of fossil plate boundaries in the Canadian Shield. Nature 262, 199–200 (1976). https://doi.org/10.1038/262199a0
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DOI: https://doi.org/10.1038/262199a0
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