Foliation

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[Geometry-mechanism]-----Planar fabric element that occurs penetratively on a mesoscopic scale in a rock. Primary foliation includesbedding and igneous layering; secondary foliations are formed by deformation induced processes.Joints are not normally considered as foliations since they are not penetrative on a mesoscopic scale. (From Passchier and trouw, 2005, Microtectonics)