Question

In the given profile section, P, Q, R, S, and T are sedimentary rocks. Identify the type of unconformity in the sedimentary sequence. 

• A. Angular unconformity
• B. Disconformity
• C. Nonconformity
• D. Paraconformity

Hint:

Angular unconformity is characterized by tilted or folded older rock layers with new layers deposited on top at a different angle.

Answer 1

The Correct Option is A

Step 1: Understanding the types of unconformities.
- Angular unconformity occurs when sedimentary layers are deposited on top of tilted or folded layers, showing a clear angular discordance.
- Disconformity is a gap in the geological record between parallel layers of sedimentary rock.
- Nonconformity occurs when sedimentary layers are deposited over older, metamorphic or igneous rocks.
- Paraconformity is a subtle type of unconformity where layers are parallel, but there is a time gap.

Step 2: Analyzing the given profile.
The diagram clearly shows layers of rock that are tilted, with new layers deposited on top. This is a classic example of angular unconformity.

Step 3: Conclusion.
The correct answer is (A) Angular unconformity.