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  1. The intricate folding, bending, or twisting-together of laminated sediments on a considerable scale, the laminae being drawn out or compressed in such a manner as to suggest kneading more than simple folding; esp. intraformational contortion. Also, the state of being contorted. AGI
  2. A structure produced by contortion. AGI

Source: Dictionary of Mining, Mineral, and Related Terms

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