Question

In the given map, the X-Y surface has the same orientation as in the Palaeozoic sequence. X-Y represents 

• A. angular unconformity
• B. non-conformity
• C. normal fault
• D. thrust

Hint:

In structural geology, a thrust fault involves horizontal displacement, which results in older rocks being pushed above younger rocks.

Answer 1

The Correct Option is D

Step 1: Understanding the question.
The question refers to a map where the X-Y surface has the same orientation as the Palaeozoic sequence. We are asked to identify the geological feature represented by this surface.
Step 2: Analyzing the options.
(A) angular unconformity: This refers to a surface where older, tilted rock layers are overlain by newer, horizontal layers. This is not the case here.
(B) non-conformity: Non-conformity refers to a situation where sedimentary rocks are deposited on top of older, igneous or metamorphic rocks. The map does not indicate this type of relationship.
(C) normal fault: A normal fault occurs when the crust is extended and one block of rock drops relative to another, but this is not the scenario depicted in the map.
(D) thrust: Correct — A thrust fault involves horizontal displacement and is characterized by a surface where older rocks are pushed over younger rocks. This matches the scenario described in the map.
Step 3: Conclusion.
The correct answer is (D) thrust, as it accurately describes the displacement of layers and the orientation described in the question.