Caption:
Type 3 fold interference arising by the superposition of an open, upright F3 fold (axial trace denoted by black dot-dash line) on a recumbent, isoclinal F2 fold (axial trace denoted by white dot-dash line), the latter defined by tightly folded S1 schistosity (solid white line) in the F2 hinge and S1+S2 transposition foliation on the F2 limbs.