The Grenville front is defined as the northwestern limit of the Grenville structural province of the Canadian shield (Stockwell, 1964; Wynne-Edwards, 1972). It strikes northeast-southwest and is approximately 1,600 km long, extending from Lake Huron to the Labrador Sea. The front separates the Grenville structural province from either the Nain, Churchill, Superior, or Southern structural province and is commonly associated with mylonitic fabrics (see Higgins, 1971 for terms usage) which strike approximately parallel to the front and dip steeply to the southeast.

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