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中国地质大学：《构造地质学》课程PPT教学课件（英文版）Lecture 13 dip isogons and fold system
Classification of folds (continue) Based on four main features or properties: 1 direction of closing and facing 2 attitude of axial surface 3 size of inter-limb angle, and 4 shape of profile 5 dip isogons
