The term fold is used in geology when one or a stack of originally flat and planar surfaces, such as sedimentary strata, are bent or curved as a result of plastic (i.e. Permanent) deformation. Synsedimentary folds are those due to slumping of material before deformation.
Folds in rocks vary in size from microscopic crinkles to mountain-sized folds. They occur singly as isolated folds and in extensive fold trains of different sizes, on a variety of scales. Folds form under varied conditions of stress, hydrostatic pressure, pore pressure, and temperature, as evidenced by their presence in soft sediments, the full spectrum of metamorphic rocks, and even as primary flow structures in some igneous rocks.
A set of folds distributed on a regional scale constitutes a fold belt, a common feature of orogenic zones. Describing folds Folds are classified by their size, fold shape, tightness, dip of the axial plane. 2D Fold Terms Looking at a fold surface in profile the fold can be divided in to ... more.
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