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Fold Classifications |
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There are many ways to classify folds based on: the thickness of folded layers, the angle between limbs, the dip of the axial surface, the plunge of the fold axis, the general shape of folds, and other weird parameters... The following introduces a number of terms used to describe folds. |
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Isopach folds: The thickness of each layers keeps constant. In similar folds it is the apparent thickness measured parallel to the axial surface that remains constant. |
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Open, tight and isoclinal, are terms referring to the angle between two successive fold limbs. |
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Upright folds have a vertical axial surface, they may or may not be symmetric. Overturned folds have one limb with youging direction pointing downward, whereas recumbent fold have sub-horizontal axial surfaces. |
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