A "type 1" fold interference pattern, characterised by domes and basins. Looking down on the outcrop surface, this pattern derives from two upright fold sets, one trending L-R across the screen and the other up and down. Classic outcrop from Loch Monar, Scotland.

A "type 2" fold interference pattern which generates rather strange "winged" or "butterfly" outcrop patterns. Looking down on the outcrop, this pattern results from a recumbent first phase of folding (with hinges trending up and down the screen) followed by upright folds trending L-R. Loch Monar, Scotland.

A "type 3" fold interference pattern which generates tongue-shapes. These shapes original from near-recumbent axial surfaces being refolded by upright folds, but with hinge lines nearly parallel.