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A monocline is a structure in which otherwise horizontal beds show

  • A.two opposed limbs of equal dip
  • B.a horizontal axial plane
  • C.a complete inversion of the sequence
  • D.a single local step of steeper dip

Answer: D

Correct answer: a single local step of steeper dip

A monocline is a one-limbed structure: the beds are horizontal, steepen briefly through a flexure, and resume horizontality at a different level. It has no opposed limbs and no true axial plane in the ordinary sense. Monoclines commonly form in a sedimentary cover draped over a fault in the basement beneath, the cover flexing where the rigid rock below has broken.

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