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Folds Descriptors |
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π and β diagrams alone can not define the attitude of the axial surface. This can be achieved by plotting on a stereogram the axial trace of the fold as well as its axis. The axial trace of a fold is the line that links, on the ground surface, points of maximum curvature on successive folded surfaces. The satellite image on the right shows the axial trace of a fold in the Kimberley (WA). By definition the axial trace, since it is defined by points of maximum curvature, lies within the axial surface. Since a planar surface is fully defined by two lines within it (cf. Euclidian geometry), the axial surface can be deduced from the axial trace and the fold hinge. |
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