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Schematic model for the tectonostratigraphic and paleogeographic evolution of the southern Quebec Appalachians between Middle Ordovician and upper Silurian times (modified from Tremblay and Pinet, 2016). The lowermost units of the Magog Group have been deposited during the climax stage of the Taconian orogeny (465–450 Ma). The initial stage, at ca. 445 to 435 Ma, of the Salinic orogeny induced the onset of sedimentation of uppermost unit of the Magog Group (the Saint-Victor Formation), that continued until major collision between Gander and composite Laurentia and the coeval uplifting of the internal Humber Zone. See article by Perrot and others, p. 1049–1094 (this issue).