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A symmetrical fold is one whose axial plane is

  • A.vertical, with limbs dipping equally
  • B.inclined, with limbs dipping unequally
  • C.horizontal, with limbs nearly parallel
  • D.absent altogether

Answer: A

Correct answer: vertical, with limbs dipping equally

A symmetrical fold has a vertical axial plane, and the two limbs are mirror images dipping at equal angles in opposite directions. It records compression applied more or less horizontally and equally from both sides. As the compression increases or becomes one-sided the axial plane rotates, giving first an asymmetrical fold, then an overturned one, and finally a recumbent fold with a horizontal axial plane.

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