Question

Identify the fold in the given figure, where T₀ and Tα represent the axial plane thicknesses at the hinge and limb, respectively. 

• A. Parallel fold
• B. Similar fold
• C. Supratenous fold
• D. Flattened parallel fold

Hint:

In structural geology, a similar fold has a similar geometry along the hinge and limbs, unlike parallel folds or other types.

Answer 1

The Correct Option is B

Step 1: Understanding the fold.
The figure represents a fold where the axial plane thickness (T₀) at the hinge is compared with that at the limb (Tα). A "similar fold" indicates that the layers on either side of the fold have a similar geometry.

Step 2: Analyzing the options.
(A) Parallel fold: This option is incorrect, as it does not match the description of the given fold.
(B) Similar fold: Correct — Similar folds show similar geometry in the hinge and limb, as represented by T₀ and Tα in the diagram.
(C) Supratenous fold: This term does not describe the type of fold shown in the figure.
(D) Flattened parallel fold: This is not applicable to the fold shown in the figure.

Step 3: Conclusion.
The correct answer is (B) Similar fold, as the geometry of the fold is consistent with this classification.