Question:
An unconformity that occurs when younger sedimentary rocks are deposited on an eroded and tilted surface of older sedimentary rocks is called as
An unconformity that occurs when younger sedimentary rocks are deposited on an eroded and tilted surface of older sedimentary rocks is called as
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An unconformity is a buried surface of erosion or non-deposition that represents a gap in the geologic record. The different kinds are distinguished by the nature of the rocks above and below the surface.
Updated On: Jun 16, 2026
- Nonconformity
- Angular unconformity
- Disconformity
- Blended unconformity
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The Correct Option is B
Solution and Explanation
Concept:
An unconformity is a buried surface of erosion or non-deposition that represents a gap in the geologic record. The different kinds are distinguished by the nature of the rocks above and below the surface.
Step 1:
Recall the definitions. A nonconformity has sedimentary rocks resting on eroded igneous or metamorphic rocks, while a disconformity has the layers above and below remaining parallel with an eroded surface between them.
Step 2:
When the older sedimentary rocks were first tilted (or folded), then eroded flat, and finally covered by younger horizontal sedimentary layers, the beds above and below meet at an angle. This angular discordance is the defining feature of an angular unconformity, which matches the description exactly.
Answer: Option (2) — Angular unconformity.
An unconformity is a buried surface of erosion or non-deposition that represents a gap in the geologic record. The different kinds are distinguished by the nature of the rocks above and below the surface.
Step 1:
Recall the definitions. A nonconformity has sedimentary rocks resting on eroded igneous or metamorphic rocks, while a disconformity has the layers above and below remaining parallel with an eroded surface between them.
Step 2:
When the older sedimentary rocks were first tilted (or folded), then eroded flat, and finally covered by younger horizontal sedimentary layers, the beds above and below meet at an angle. This angular discordance is the defining feature of an angular unconformity, which matches the description exactly.
Answer: Option (2) — Angular unconformity.
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