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زمینشناسی و معدن::
برگوارگی، تورق
Foliation and rock cleavage were examined in Chapter 8; this chapter is devoted to the other major structural features of Earth's crust and the tectonic forces that pro- duce them.
as foliation and rock cleavage that were introduced in Chapter 8.
Small- scale deformation of rocks by shear stresses occurs along closely spaced parallel surfaces of weakness, such as foliation surfaces and microscopic fractures, where slippage changes the shape of rocks.
By contrast, sedi- mentary rocks that are weakly cemented or metamorphic rocks that contain zones of weakness, such as foliation, are more susceptible to ductile deformation and tend
Crustal deformation produces geologic structures that include folds, faults, joints, foliation, and rock cleavage.
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