Question

Rock layers labeled 1 to 10 from top to bottom. Above layer 1 is labeled Kaiparowits Plateau. Layer 7 has label Glen Canyon.
Use the law of superposition to choose the correct answer for the following questions about rock layers and relative age.

Which layer is older than Layer 6?


Which layers are younger than Layer 4?


Which layers were deposited before Layer 5?

Answer 1

Law of superposition: in an undisturbed sequence, lower layers are older than layers above them.

1) Layers older than Layer 6: Layers 7, 8, 9, 10.

2) Layers younger than Layer 4: Layers 1, 2, 3.

3) Layers deposited before (i.e., older than) Layer 5: Layers 6, 7, 8, 9, 10.