A zigzag fold is a type of chevron fold characterized by angular, sharp hinges and relatively straight limbs. These folds are significant in structural geology for understanding the deformation of rocks under compressional stress, the development of fold-and-thrust belts, and the interpretation of subsurface structures in tectonically active regions.
Reference: Ramsay, J. G. (1967). “Folding and Fracturing of Rocks.” McGraw-Hill.