The article discusses the geometry and kinematics of fault-bend folding, a process by which folds in sedimentary sequences are formed by the bending of fault blocks as they ride over non-planar fault surfaces. This type of folding is common in fold-and-thrust belts and is closely related to other folding mechanisms such as fault propagation and reverse drag. The paper presents a geometric and kinematic description of parallel fault-bend folds, focusing on the relationship between fault shape and fold shape for sharp bends in faults. These relationships are useful for developing internally consistent cross sections in areas of suspected fault-bend folding. The paper explains that fault-bend folding occurs when a fault surface is not planar, leading to distortion within at least one of the fault blocks as they slip past each other. The rocks may fold in response to riding over a bend in a fault. This mechanism is well known in fold-and-thrust belts, in so-called "reverse drag" associated with flattening normal faults, and in "flower structures" associated with bends in strike-slip faults. Fault-bend folding is closely related geometrically to folding of preexisting faults and refraction of axial surfaces across angular unconformities. The paper presents an idealized two-dimensional geometric description of fault-bend folding, which has applications to all these phenomena. However, the emphasis is on folds produced by thrust faults and their imbrications. Several sections on applications illustrate the quantitative use of the theory to decipher subsurface map-scale structure in fold-and-thrust belts. The paper discusses the kinematics of fault-bend folding caused by a simple step in decollement along a thrust fault. It illustrates how the slip is not constant along the fault but decreases on the left-hand side because slip is taken up in kink bands. Axial surfaces remain fixed with respect to the foot-wall block, while axial surfaces in the hanging-wall block are fixed in the hanging-wall beds and move with the thrust sheet. The paper also discusses the relationship between the shape of folds and the shapes of faults responsible for the folds through the mechanism of fault-bend folding. It presents a simplified, yet widely applicable, two-dimensional geometric and kinematic theory of folding due to slip past a series of sharp bends in a fault. The theory is general and can be applied to various types of fault bends, including convex and concave bends. The paper also discusses the application of the theory to real structures, such as the Hukou-Yangmei anticline in western Taiwan. It shows how the theory can be used to interpret subsurface structures and determine the shape of faults responsible for the folds. The paper also discusses the implications of the theory for understanding the deformation of fault-bend folds, including the effects of shear and the branching of axial surfaces. The paper concludes by discussing the implications of the theory for understanding the deformation of fault-bend folds in fold-and-thrust belts, including the effects of multiple imbrications andThe article discusses the geometry and kinematics of fault-bend folding, a process by which folds in sedimentary sequences are formed by the bending of fault blocks as they ride over non-planar fault surfaces. This type of folding is common in fold-and-thrust belts and is closely related to other folding mechanisms such as fault propagation and reverse drag. The paper presents a geometric and kinematic description of parallel fault-bend folds, focusing on the relationship between fault shape and fold shape for sharp bends in faults. These relationships are useful for developing internally consistent cross sections in areas of suspected fault-bend folding. The paper explains that fault-bend folding occurs when a fault surface is not planar, leading to distortion within at least one of the fault blocks as they slip past each other. The rocks may fold in response to riding over a bend in a fault. This mechanism is well known in fold-and-thrust belts, in so-called "reverse drag" associated with flattening normal faults, and in "flower structures" associated with bends in strike-slip faults. Fault-bend folding is closely related geometrically to folding of preexisting faults and refraction of axial surfaces across angular unconformities. The paper presents an idealized two-dimensional geometric description of fault-bend folding, which has applications to all these phenomena. However, the emphasis is on folds produced by thrust faults and their imbrications. Several sections on applications illustrate the quantitative use of the theory to decipher subsurface map-scale structure in fold-and-thrust belts. The paper discusses the kinematics of fault-bend folding caused by a simple step in decollement along a thrust fault. It illustrates how the slip is not constant along the fault but decreases on the left-hand side because slip is taken up in kink bands. Axial surfaces remain fixed with respect to the foot-wall block, while axial surfaces in the hanging-wall block are fixed in the hanging-wall beds and move with the thrust sheet. The paper also discusses the relationship between the shape of folds and the shapes of faults responsible for the folds through the mechanism of fault-bend folding. It presents a simplified, yet widely applicable, two-dimensional geometric and kinematic theory of folding due to slip past a series of sharp bends in a fault. The theory is general and can be applied to various types of fault bends, including convex and concave bends. The paper also discusses the application of the theory to real structures, such as the Hukou-Yangmei anticline in western Taiwan. It shows how the theory can be used to interpret subsurface structures and determine the shape of faults responsible for the folds. The paper also discusses the implications of the theory for understanding the deformation of fault-bend folds, including the effects of shear and the branching of axial surfaces. The paper concludes by discussing the implications of the theory for understanding the deformation of fault-bend folds in fold-and-thrust belts, including the effects of multiple imbrications and