Question

Which of the following about axial plane is not true.

(a) Axial plane is imaginary

(b) Axial plane may be vertical, inclined or horizontal

(c) Axial plane may be planar or non-planar

(d) Axial plane need not pass through all points of maximum curvature in a folded sequence

This question was posed to me in class test.

The origin of the question is Parts of a Fold topic in chapter Folds and Folding of Engineering Geology

Answer 1

Right answer is (d) Axial plane need not pass through all points of maximum curvature in a folded sequence

Easiest explanation: An axial plane is defined as an imaginary plane that passes through all the points of maximum curvature in a folded sequence. It may be vertical, inclined or horizontal. Also, it can be either planar or non-planar.