Question

There is one of each type of unconformity in the given choices. Name at least one of each of them by indicating the layers that they are between.
Nonconformity
Angular unconformity
Disconformity

Answer 1

1. Nonconformity
A nonconformity exists between sedimentary rocks and metamorphic or igneous rocks when the sedimentary rock lies above and was deposited on the pre-existing and eroded metamorphic or igneous rock. Namely, if the rock below the break is igneous or has lost its bedding due to metamorphism, the plane of juncture is a nonconformity.

2. Angular unconformity
An angular unconformity is an unconformity where horizontally parallel strata of sedimentary rock are deposited on tilted and eroded layers, producing an angular discordance with the overlying horizontal layers. The whole sequence may later be deformed and tilted by further orogenic activity. A typical case history is presented by the paleotectonic evolution of the Briançonnais realm (Swiss and French Prealps) during the Jurassic.

3. Disconformity
A disconformity is an unconformity between parallel layers of sedimentary rocks which represents a period of erosion or non-deposition. Disconformities are marked by features of subaerial erosion. This type of erosion can leave channels and paleosols in the rock record. A paraconformity is a type of disconformity in which the separation is a simple bedding plane with no obvious buried erosional surface.

Answer 2

The three basic types of unconformity are nonconformity, angular unconformity and disconformity.

Unconformity can be defined as a surface layer that separates two rocks of different masses and age. This indicates that the deposition of sediments in those layers are  not continuous.

When unconformity is found in a geological record it indicates:

• deformation,
• erosion, and
• sea level variations.

There are three types of unconformity which includes:

1. Nonconformity: This is the type of unconformity that is found between sedimentary rocks and metamorphic rocks.

    2. Angular unconformity: This is the type of unconformity where deposition of tilted and eroded surface layers separates horizontally parallel strata of sedimentary rock.

    3. Disconformity: This is a type of unconformity that occurs between parallel layers of sedimentary rocks which is a period of erosion.

Therefore, the three basic types of unconformity are nonconformity, angular unconformity and disconformity.

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