<Ul> <Li> Anticline: linear, strata normally dip away from axial center, oldest strata in center irrespective of orientation . </Li> <Li> Syncline: linear, strata normally dip toward axial center, youngest strata in center irrespective of orientation . </Li> <Li> Antiform: linear, strata dip away from axial center, age unknown, or inverted . </Li> <Li> Synform: linear, strata dip toward axial center, age unknown, or inverted . </Li> <Li> Dome: nonlinear, strata dip away from center in all directions, oldest strata in center . </Li> <Li> Basin: nonlinear, strata dip toward center in all directions, youngest strata in center . </Li> <Li> Monocline: linear, strata dip in one direction between horizontal layers on each side . </Li> <Li> Chevron: angular fold with straight limbs and small hinges </Li> <Li> Recumbent: linear, fold axial plane oriented at low angle resulting in overturned strata in one limb of the fold . </Li> <Li> Slump: typically monoclinal, result of differential compaction or dissolution during sedimentation and lithification . </Li> <Li> Ptygmatic: Folds are chaotic, random and disconnected . Typical of sedimentary slump folding, migmatites and decollement detachment zones . </Li> <Li> Parasitic: short wavelength folds formed within a larger wavelength fold structure - normally associated with differences in bed thickness </Li> <Li> Disharmonic: Folds in adjacent layers with different wavelengths and shapes </Li> </Ul> <Li> Anticline: linear, strata normally dip away from axial center, oldest strata in center irrespective of orientation . </Li> <Li> Syncline: linear, strata normally dip toward axial center, youngest strata in center irrespective of orientation . </Li> <Li> Antiform: linear, strata dip away from axial center, age unknown, or inverted . </Li>

Why do most folded structures develop bedding planes