Unconformities

Scientific study of rock layers

• Archeology

• Stratigraphy

• Paleontology

• Geology

What scientific law tells us that in rock strata, the oldest layer is at the bottom and the youngest layer is at top?

• Cross-cutting

• Original Horizontality

• Superposition

• Unconformities

A gap in the sequence of sedimentary rock layers caused by erosion.

• Inclusion

• Unconformity

• Cross-cutting

• Isotope

The Law of Superposition helps scientists to determine what?

• The absolute age of rock layers
• The age of fossils
• The relative age of rock layers
• the super powers of rocks

According to the law of superposition, the oldest fossils are found 

• At the top of the rock layers
• Near the bottom of the rock layers
• In the middle of the rock layers
• Somewhat near the surface

_{Which rock layer in the diagram seems to be the oldest?}

• F
• E
• B
• A

The ________ states that layers of sediment were originally deposited horizontally under the action of gravity.

• law of superposition
• law of horizontality 
• uniformitarianism 
• unconformities

What type of unconformity is shown here?

• Non-conformity

• Disconformity

• Angular unconformity

What type of unconformity is shown here?

• Non-conformity

• Disconformity

• Angular unconformity

What type of unconformity is shown here?

• Non-conformity

• Disconformity

• Angular unconformity