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An unconformity is
1. A surface of erosion or non-deposition as detected in a sequence of rocks
2. A layer of boulders and pebbles in a sequence of rocks
3. A layer of clay or shale in an igneous mass
4. A type of joint especially associated with folded and faulted rocks

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Correct Answer - Option 1 : A surface of erosion or non-deposition as detected in a sequence of rocks

Concept:

An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous.

An unconformity is a contact between two rock units in which the upper unit is usually much younger than the lower unit.

The contact is more obvious than a disconformity because the rock units are not parallel and at first appear cross‐cutting.

Note:

An angular unconformity is the contact that separates a younger, gently dipping rock unit from older underlying rocks that are tilted or deformed layered rock.

Angular unconformities generally represent a longer time hiatus than do disconformities because the underlying rock had usually been metamorphosed, uplifted, and eroded before the upper rock unit was deposited.

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