Fold Geometry - 3-D Structural Geology - page 111

Fig. 5.5. Conical folds showing trend and plunge of crest line. a Type I plunge. b Type II plunge. c Ta n g e n t
diagram of bed attitudes in a type I plunging fold. d Tangent diagram of bed attitudes in a type II
plunging fold. (After Bengtson 1980)
Fig. 5.6.
Projection directions in a
type I conical fold