Question

The crest and trough may or may not coincide with the axis.

(a) True

(b) False

The question was posed to me in examination.

My question is based upon Parts of a Fold in section Folds and Folding of Engineering Geology

Answer 1

Correct option is (a) True

To explain I would say: The line running through the highest points in an uparched fold defines the crest and similarly the line running through the lowest point in a downarched fold makes its trough. The crest and trough may or may not coincide with the axis of the fold.