= Flexural slip
Relative movement parallel to bedding during <folding>, allowing layers at different radii of curvature to accommodate different arc lengths. For two layer surfaces separated by thickness $h$ through bend angle $\theta$, their arc-length difference is approximately $h\theta$. Bedding-parallel slip can accommodate that mismatch without requiring each layer to stretch by the same amount. Shallow <flexural slip> can produce surface breaks above a <blind reverse fault>.
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