Folds can also be classified into non-plunging fold and plunging fold according to the orientation of hinges.
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According to the relationship of the axial plane to the limbs, fold can be classified into:
A. symmetrical
B. overturned
C. recumbent
D. asymmetrical
According to the shapes of folds in cross-section, folds can be classified into:
A. box fold
B. overturned fold
C. fan fold
D. chevron fold
E. monocline
Rock deformations usually include brittle deformation and ductile deformation.
Strain is the change in shape of a rock caused by differential stress.