Figures A and B show two cross-sections of a folded sandstone bed. Which one of the following is the correct interpretation of the Figs. A and B?
To determine the correct interpretation of Figures A and B, we need to understand the concepts of normal and overturned limbs in geological folds.
Normal Limb: In a geological fold, a normal limb is oriented such that the younger layers are on top and the older layers are below, following the natural order of deposition.
Overturned Limb: An overturned limb is where the layers are tilted so much that they are upside down, causing the older layers to appear above younger layers, disrupting the normal stratigraphic sequence.
Figures A and B showing cross-sections of a folded sandstone bed
By examining the Fig. A and Fig. B:
- Figure A: The bedding is shown with a gentle dip, indicating that the layers maintain their original order with younger layers at the top. This suggests that Figure A represents a normal limb.
- Figure B: The bedding is significantly tilted, which is a characteristic of an overturned limb where layers are flipped from their natural sequence. This indicates that Figure B represents an overturned limb.
Therefore, the correct interpretation is:
A- Normal limb, B- Overturned limb
This matches the option: A- Normal limb, B- Overturned limb
Important Questions from Folds
The following figure shows the lower hemisphere, equal area plots of the poles to bedding surfaces. Which one of the following is the correct interpretation?
- The intersection of bedding surface with upright slaty cleavage surface occurs as horizontal lineation. Which one of the following is the most likely interpretation? The bedding surfaces are folded into
Match the outcrop patterns of folds with corresponding types.
Outcrop Patterns Fold A. 
P. Plunging antiform B. 
Q. Plunging synform C. 
R. Reclined D. 
S. Recumbent - Which one of the following is the correct angle between the hinge line and the strike line of the axial plane in a reclined fold?
- The horizontal equivalent, measured between two successive strike lines on a map, for a vertical bed is:
