Whereas rocks of the Avalon Zone in Newfoundland are in fault contact with those of the Gander Zone, rocks identifiable as equivalents of the Gander Zone in New Brunswick are separated from the Avalon Zone by a 65 km wide belt of Silurian, Ordovician, and older rocks. This belt, referred to as the Fredericton Zone, contains a number of fault bounded blocks, each containing contrasting depositional, structural, and metamorphic histories. It is concluded that the Gander/Avalon Zone boundary in southern New Brunswick has controlled the development of subsequent basins, which have been deformed by Taconic and Acadian movements. In Newfoundland, the same boundary has remained essentially inactive in Paleozoic times.

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