Unconformities

Describe what happened to form an angular unconformity?

• An earthquake occurred and caused the tilt of the rock layers, then sedimentary rock formed on top.

• A volcanic eruption happened moving the rock layers out of place.

• Weathering and erosion happened to uplifted layers, then horizontal sedimentary layers formed on top.

The disconformity in this picture exists between which two layers? (Describe the two layers by color)

• The last layer (purple) and the red layer

• The green and yellow layers

• the green and the top purple layer

Describe the difference between a disconformity and an angular unconformity.

• The both have weathering and erosion to cause the unconformity.

• A disconformity has titled layers and an angular unconformity does NOT.

• A disconformity does not have tilted layers and an angular unconformity does.

What conditions make a nonconformity?

• A nonconformity exists when a non-sedimentary rock layer comes in contact with sedimentary rock layers.

• A nonconformity exists when a sedimentary rock layer comes in contact with sedimentary rock layers.

• A nondonformity exists when weathering and erosion happen.

What are the three types of unconformities?

• Conformity, unconformity, and nonconformity

• Angular unconformity, disconformity, and nonconformity

• Unconformity, disconformity, and nonconformity