Question

Which one of the following lineations can be observed on a foliation with an attitude 210°, 40° NW?

• A. 40°→300°
• B. 40°→ 040°
• C. 40°→ 220°
• D. 40°→ 350°

Hint:

Always remember: For any planar structure, lineation plunge direction follows the dip direction. Strike gives orientation, dip direction + dip angle gives the true lineation.

Answer 1

The Correct Option is A

Step 1: Interpret the given foliation.
The attitude of foliation is given as \(210^\circ, 40^\circ \ \text{NW}\). This represents: - Strike = \(210^\circ\). - Dip = \(40^\circ\) towards NW (i.e., azimuth $\approx$ \(300^\circ\)). Step 2: Recall lineation concept.
Lineations observed on a foliation plane must lie within the foliation surface. The plunge direction of a lineation is determined by the dip direction of the plane. Step 3: Match with options.
- The dip direction here is \(300^\circ\) with plunge \(40^\circ\). - This corresponds to the option: \(40^\circ \rightarrow 300^\circ\). Final Answer: \[ \boxed{40^\circ \rightarrow 300^\circ} \]