Question
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
The correct answer is
A - R, B - S, C - P, D - Q
To accurately match the outcrop patterns with the corresponding types of folds, consider the characteristics of each fold type:
- Plunging Antiform: This type of fold shows oblique elongation in the surface rocks due to the plunging angle, forming an arch-like structure.
- Plunging Synform: This fold is characterized by a downward closure with a plunge, resulting in a trough-like appearance when viewed from above.
- Reclined Fold: The axial plane of this fold is inclined, and the fold limbs dip in the same direction but at different angles, creating a distinctive outcrop pattern.
- Recumbent Fold: This type of fold shows horizontal or near-horizontal axial planes and is typically characterized by an extreme amount of folding, producing horizontal patterns on the surface.
Now, match each image with the corresponding fold description:
- Image A: The pattern suggests an inclined but not horizontal structure, implying it is a Reclined Fold.
- Image B: The outcrop is nearly horizontal, indicative of a Recumbent Fold.
- Image C: The arch-like structure represents a Plunging Antiform.
- Image D: This shows a trough-like pattern, indicative of a Plunging Synform.
Thus, the correct matching is: A - R, B - S, C - P, D - Q.
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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
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?
- 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:
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