Question

On level surface, elliptical outcrops are commonly exhibited by:

• A. Plunging antiforms
• B. Doubly plunging folds
• C. Non-plunging folds
• D. Plunging synforms

Hint:

Doubly plunging folds commonly produce elliptical or closed outcrop patterns.

Answer 1

The Correct Option is B

Concept:
Outcrop patterns of folds depend on whether the fold is plunging, non-plunging or doubly plunging.

Step 1: Understand elliptical outcrop pattern.
An elliptical outcrop pattern is produced when the fold closes at both ends.

Step 2: Identify the fold type.
A doubly plunging fold plunges in two opposite directions. Because of this, the outcrop pattern becomes elliptical or closed on a level surface. \[ \text{Elliptical outcrop} \Rightarrow \text{Doubly plunging fold} \]

Step 3: Final answer.
Therefore, elliptical outcrops are commonly exhibited by doubly plunging folds. \[ \therefore \text{Correct Answer is (B)} \]