The Semri and Kaimur Series in the Son valley region have undergone two phases of deformation. The first phase structures are penetrative recumbent folds, minor puckers and kinks. The second phase structures are open folds of varying wave lengths. The deformation is a post-Kaimur event. Markundi fault seems to have existed before folding.

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First page of Superposed Folding in the Lower Vindhyans of Dala-Gurma Area, Mirzapur District
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