The presence of oblique, sinusoidal, internal foliations in dikes appears to result in many cases from lateral slip of the dike walls, prior to its complete consolidation, in the direction normal to the line of intersection between the dike walls and its internal foliation. The sense of slip is such that S-shaped patterns in the internal foliation result from dextral movements, and Z-shaped from sinistral. A population of variably oriented and synchronous dikes of this kind should, therefore, permit the determination of the directions of the principal stresses, on the assumption that the movement of their walls is a response to an incremental stress field. The dynamic analysis can be carried out by the standard methods used in petrofabric studies for determining the directions of principal stresses from twin and translation gliding.

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