from The Century Dictionary and Cyclopedia

  • n. In geology, an arrangement of closely folded strata such that the axis-planes of the folds dip, on each side of a mountain-mass or -range, toward the central axis-plane of the range itself, so that the whole has a structure, as exhibited in a cross-section, resembling that shown by an open fan held upright. This arrangement occurs in the most marked degree in certain parts of the chain of the Alps.


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