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A fold with interlimb angle of zero is :

  • A.Gentle
  • B.Open
  • C.Tight
  • D.Isoclinal

Answer: D

A fold with an interlimb angle of zero is Isoclinal.

Folds are classified by the angle between their limbs (Fleuty's scheme): gentle 180-120 degrees, open 120-70, close 70-30, tight 30-0 (exclusive), and isoclinal at 0 degrees, when the two limbs are parallel.

Gentle, open and tight folds all have limbs at an angle to each other, so they cannot have an interlimb angle of zero; a tight fold approaches but does not reach it.

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