Rocks that display contorted folds and other evidence of ductile flow usually were deformed at great depth.

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Rocks that show ductile deformation, such as contorted folds, are typically formed at great depths where heat and pressure cause the rocks to behave in a ductile manner. In contrast, rocks that display brittle deformation, such as faulting, are typically formed in shallower depths where lower temperatures and pressures cause them to deform in a brittle manner.

Rocks That Display Contorted Folds and Other Evidence of Ductile