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In geology, an isoclinal fold is a type of fold where the two limbs (sides) are essentially parallel to each other and to the axial plane. This means the fold is so closely compressed that its limbs lie nearly flat.1

Folds, in general, are undulations or waves in stratified rocks of Earth's crust. These rocks were originally deposited in flat, horizontal sheets but can be warped by various geological forces. Isoclinal folds are a specific classification based on the attitude of their axes and their appearance in cross-sections.1

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