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Folds And Faults In Rock. Fault-Bend Folds Are Caused By Displacement Along A Non-Planar Fault. In Non-Vertical Faults, The Hanging-Wall Deforms To Accommodate The Mismatch Across The Fault As Displacement Progresses. Fault Bend Folds Occur In Both Extensional And Thrust Faulting. ... Displacement Over This Higher-Angle Ramp Generates The Folding.