Hermitage flexure is the name given by Williams and others to the sinusoidal trend of basement and cover rocks (the eastern crystalline belt) in south-central Newfoundland. These authors postulated that the sinusoidal nature was due to large-scale Acadian folding about a north-south axial surface, and they reiterated this conclusion in later papers. Recent work, however, has shown that the flexure is an internal feature of the eastern crystalline belt and that the curvature of the structures is an original characteristic. Thus, the Hermitage flexure was formed as part of the main Appalachian erogenic event resulting from closure of the proto-Atlantic Ocean rather than as later, large-scale folding.

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