Question

Match the primary sedimentary structure in Group I with the corresponding process of formation in Group II. 
\[\begin{array}{|l|l|} \hline \textbf{Group I} & \textbf{Group II} \\ \hline \text{P. Asymmetric ripples} & \text{1. Water escape} \\ \hline \text{Q. Dish and pillar} & \text{2. Bed load transportation of sediments} \\ \hline \text{R. Flute cast} & \text{3. Deposition from alternate traction and suspension load} \\ \hline \text{S. Wavy bedding} & \text{4. Scouring by turbulent eddy} \\ \hline \end{array}\]

• A. P-1, Q-2, R-3, S-4
• B. P-2, Q-3, R-1, S-4
• C. P-1, Q-4, R-3, S-2
• D. P-2, Q-4, R-1, S-3

Hint:

Sedimentary structures such as ripples, bedding, and flute casts are key indicators of past environmental conditions and sediment transport mechanisms.

Answer 1

The Correct Option is B

Step 1: Understanding sedimentary structures.
- Asymmetric ripples are formed by the movement of water in a unidirectional flow, typically formed by scouring from a turbulent eddy.
- Dish and pillar structures are related to the transportation of sediments and bed load movement.
- Flute casts are formed by scouring processes, where a turbulent flow of water erodes the sediment.
- Wavy bedding typically results from deposition in an environment where sediment is alternately deposited from traction and suspension loads.

Step 2: Analyzing the options.
(A) P-1, Q-2, R-3, S-4: Correct — This option correctly matches the structures with their formation processes.
(B) P-2, Q-3, R-1, S-4: Incorrect.
(C) P-1, Q-4, R-3, S-2: Incorrect.
(D) P-2, Q-4, R-1, S-3: Incorrect.

Step 3: Conclusion.
The correct answer is (A) P-1, Q-2, R-3, S-4, as it properly matches the sedimentary structures with their corresponding processes.