How can folding and faulting alter the original positions of sedimentary strata?

Sedimentary strata are initially deposited as nearly horizontal layers. Folding and faulting act as secondary processes that deform these primary structures, altering their original positions.12

Folding
Folding involves the warping of strata into undulations or waves. This process can tilt layers from their original horizontal orientation, creating structures such as anticlines (convex upward) and synclines (concave upward). In extreme cases, such as recumbent folds, the strata may be warped until they lie nearly flat or are overturned. These deformations are often driven by compressional forces or gravity.1

Faulting
Faulting occurs when rocks are displaced along a fracture. Unlike joints, where no movement occurs, faults involve the movement of rock masses on either side of a fracture in opposite directions. This displacement can physically shift segments of sedimentary strata, moving them from their original stratigraphic position. In mountain belts, large-scale thrust faults can transport and stack slices of sedimentary rock, significantly altering their spatial arrangement relative to the underlying basement.234