Question:
Which one of the following refers to overturned fold?
Which one of the following refers to overturned fold?
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A fold is a bend in rock layers. Folds are classified by the orientation of their axial plane (the imaginary surface that splits the fold symmetrically) and their limbs (the two sides of the fold).
Updated On: Jun 16, 2026
- A fold with an axial plane so inclined that one limb is upside down
- A trough-like shape with the youngest rocks in the center
- A bend with only one dipping limb
- An arch-like shape with the oldest rocks in the centre
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The Correct Option is A
Solution and Explanation
Concept:
A fold is a bend in rock layers. Folds are classified by the orientation of their axial plane (the imaginary surface that splits the fold symmetrically) and their limbs (the two sides of the fold).
Step 1:
Recall the definitions. A trough with the youngest rocks in the centre describes a syncline, an arch with the oldest rocks in the centre describes an anticline, and a fold with only one limb dipping describes a monocline.
Step 2:
In an overturned fold, the axial plane is tilted (inclined) so strongly that both limbs dip in the same direction, and one of the limbs has been rotated past vertical so that its rock layers are turned upside down. This matches the first option.
Answer: Option (1) — A fold with an axial plane so inclined that one limb is upside down.
A fold is a bend in rock layers. Folds are classified by the orientation of their axial plane (the imaginary surface that splits the fold symmetrically) and their limbs (the two sides of the fold).
Step 1:
Recall the definitions. A trough with the youngest rocks in the centre describes a syncline, an arch with the oldest rocks in the centre describes an anticline, and a fold with only one limb dipping describes a monocline.
Step 2:
In an overturned fold, the axial plane is tilted (inclined) so strongly that both limbs dip in the same direction, and one of the limbs has been rotated past vertical so that its rock layers are turned upside down. This matches the first option.
Answer: Option (1) — A fold with an axial plane so inclined that one limb is upside down.
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