Question:
The orientations of the fold axis and axial plane in the given figure indicate
The orientations of the fold axis and axial plane in the given figure indicate
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In fold classification, a recumbent fold is characterized by a horizontal or nearly horizontal axial plane with nearly parallel limbs.
Updated On: Dec 14, 2025
- reclined fold
- vertical fold
- recumbent fold
- horizontal fold
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The Correct Option is A
Solution and Explanation
In the stereonet, the fold axis is plotted as a point inside the net, not on the primitive → the fold axis is plunging (not horizontal).
The axial plane is shown as a curved great circle that is neither vertical nor horizontal, indicating the axial plane is inclined.
Fold classification depends on:
- Fold axis plunging
- Axial plane inclined
Comparison with options:
Reclined fold → plunging fold axis + inclined axial plane
Vertical fold → axial plane vertical
Recumbent fold → axial plane nearly horizontal
Horizontal fold → fold axis horizontal
Answer: (A)
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