If the two limbs of a fold are parallel and inclined at same angle but not horizontal, is known as :

Question

Accepted Answer

Isoclinal fold

**Explanation:**

An **isoclinal fold** is defined as a fold where the limbs are parallel to each other. The key characteristic is the parallelism of the limbs, regardless of the angle of inclination (as long as it's the same for both limbs). The question specifies that the limbs are parallel and inclined at the same angle (but not horizontal), which perfectly matches the definition of an isoclinal fold.

**Why the other options are incorrect:**

*   **Recumbent fold:** A recumbent fold is characterized by limbs that are essentially horizontal. While the limbs *could* be parallel in a recumbent fold, the defining feature is the near-horizontal orientation. The question explicitly states the limbs are *not* horizontal, thus eliminating this option.

*   **Monoclinal fold:** A monoclinal fold is a simple bend or flexure in otherwise horizontal strata. It has only one limb dipping between two horizontal or nearly horizontal sections. It doesn't involve parallel limbs inclined at the same angle.

*   **Overturned fold:** An overturned fold is a fold where one limb has been tilted beyond the vertical. While the limbs *could* be inclined, the defining characteristic is that one limb is overturned (past vertical), which is not a requirement or implication of the question's description of parallel limbs inclined at the same angle. The limbs are not necessarily parallel in an overturned fold.