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 geology, non-conformities occur when younger sedimentary layers are deposited on top of older, different rock types (igneous or metamorphic).

Answer 1

The Correct Option is B

Step 1: Understanding the question.
The question refers to a map where the X-Y surface is compared with the Palaeozoic sequence, and we are asked to identify the type of geological feature represented by this surface.
Step 2: Analyzing the options.
(A) angular unconformity: This refers to layers of rock that are tilted or folded, with newer layers deposited on top. This is not the case here.
(B) non-conformity: Correct — Non-conformity occurs when sedimentary rocks overlie older igneous or metamorphic rocks, which fits the scenario described in the map.
(C) normal fault: This occurs when the crust is extended, causing a drop in one side of the fault, but this is not depicted in the map.
(D) thrust: A thrust fault involves horizontal displacement, which does not match the description in the question.
Step 3: Conclusion.
The correct answer is (B) non-conformity, as it accurately describes the relationship between the Palaeozoic sequence and the overlying layers in the map.