Group 7 Eng. Geology-Unconformities

Which of the following types of unconformities occur when an older package of sediments has been titled and truncated by erosion

• Angular unconformites

• Disconformities

• Nonconformities

• None of the above

The contact that separates a younger sedimentary rock unit from an igneous intrusive rock is known as

• Angular unconformities

• Disconformities

• Nonconformities

• None of the above

Which type of rock indicate a long period of erosion prior to deposition of the sediments

• Angular Unconformities

• Disconformities

• Nonconformities

• None of the above

The erosional contact that are parallel to the bedding planes of the upper and lower rock is known as

• Angular Unconformities

• Disconformities

• Nonconformities

• None of the above

The type of geological contact and a boundary between rocks, caused by a period of erosion or a pause in sediment accumulation followed by the deposition of sediments is known as

• Disconformities

• Unconformities

• Nonconformities

• None of the above

The contact between two rock unit which are typically buried erosional surfaces that can represent a break in the the geologic record of the hundreds of the millions of the years

• Disconformities

• Unconformities

• Nonconformities

• None of the above

The contact that separates a younger, gently dipping rock unit from older underlying rock is known as

• Angular Unconformities

• Disconformities

• Nonconformities

• Unconformities

During Angular unconformities, the contact is more obvious that a disconformity because

• the rock unit is parallel and at first appear cross-cutting

• the rock unit is not parallel and at first appear cross-cutting

• the rock unit is vertical and at first appear cross-cutting

• the rock unit is not parallel and at first appear cross-cutting

Which of the following types of unconformities is as a result of erosion but can occasionally represent periods of nondeposition

• Angular Unconformities

• Disconformities

• Nonconformities

• None of the above

Disconformities are marked by features of

• Subaerial erosion

• Nonaerial erosion

• All of the above

• None of the above