Unconformities

What is the principle of cross-cutting relationships?

• Rocks are deposited in horizontal layers.

• Older rocks are cut by younger features.

• Fossils are found in specific rock layers.

This is a surface where the rock has eroded away, producing a break, or gap, in the rock record.

• unfonformity

• inconsistancy

• uniformity

• correlation

Tags

NGSS.MS-ESS1-4

Scientific study of rock layers

• Archeology

• Stratigraphy

• Paleontology

• Geology

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

What type of unconformity is shown here?

• Non-conformity

• Disconformity

• Angular unconformity

Tags

NGSS.MS-ESS1-4

What type of unconformity is shown here?

• Non-conformity

• Disconformity

• Angular unconformity

Tags

NGSS.MS-ESS1-4

What THREE(3) geologic principles(or laws) is best displayed here?

• Superposition

• Original horizontality

• Cross-cutting relationships

• Unconformities

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

How do we know that Intrusion A is YOUNGER THAN Layer C?

• Law of Superposition

• Law of Cross Cutting Relationships

• Law of Inclusions

• Law of Unconformities

Which type of unconformity occurs when sedimentary rock layers are deposited on top of eroded igneous or metamorphic rock?

• Angular unconformity

• Disconformity

• Nonconformity

• Paraconformity

What does an angular unconformity indicate about the geological history of an area?

• Continuous sediment deposition

• A period of erosion followed by deposition

• A volcanic eruption

• A meteor impact

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

In which type of unconformity are the rock layers parallel, but there is a gap in the geologic time record?

• Angular unconformity

• Disconformity

• Nonconformity

• Paraconformity

Tags

NGSS.MS-ESS1-4