Abstract
Field data from a deformed clastic sedimentary series in northwestern Ontario disclose two directions of elongation-one indicated by the folding; the second, by the parallelism of linear elements, such as conglomerate boulders and individual mineral grains, to the fold axes. These two directions of elongation are normal to each other and are unequally developed, the major one being parallel to the linear elements and to the axial lines of the folds. A hypothesis recently outlined by Sander best explains this dual elongation. It postulates a shear couple essentially normal to the axial lines of the folds, combined with intergranular rotational movements. The intermediate axis of strain (B) is parallel to the fold axes and to the linear elements and is unique in that it is a minor axis of elongation (for triaxial deformation) and also an axis of rotation. This results in the effective elongation of the structure being parallel to B, while elongation parallel to A (the long axis of strain) is retarded in its...
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