Stratigraphic units in the Mount Sainte-Marguerite area belong to the Oak Hill Group and form a complex allochthonous syncline northwest of the Notre-Dame anticlinorium. These units were folded three times. The first two phases of folding (attributed to the Taconic Orogeny) produced domes and structural basins flattened and stretched along their plunge. These structures plunge with an average angle of 30° to the northwest. The first two phases of folding also produced interference patterns in the form of hooks and crescents along with complex multilobate forms. A third deformation slightly affected the interference patterns.Each phase of deformation was accompanied by low-grade dynamothermal metamorphism. The second metamorphic episode reached the quartz–albite–muscovite–chlorite grade of the greenschist fades. This event was active for some time after the end of the second phase of deformation. [Journal Translation]

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