Question

A geologist finds four layers of sedimentary rock. She determines that no geologic events have shifted the layers. She labels the layers A, B, C, and D from the top to the bottom.
Which statement about these layers is accurate?

A is older than B.
B is older than C.
C is younger than A.
B is younger than D.

Answer 1

The answer is; B is younger than D

In sedimentary rocks, the bottom layers are older that overlaying layers. This is because sediments are placed on top of each other by surface runoffs to ocean beds. Therefore, the first sediments to be deposited will always be towards the bottom as more and newer ones are brought in and deposited.

Answer 2

Based on the principle of superposition in geology, the accurate statement from the options is the option (D) ; B is younger than D

• The principle of superposition in geology states that in a sequence of deposited rocks, the oldest layer lies at the bottom and the youngest at the top.

• Using the stated principle; A --> B--> C --> D (arranged from oldest to youngest) since A lies at the top.

• Layer A is younger than Layer B and Layer B is younger than C

• Layer C is older than A and Layer B is younger than D

Therefore, the accurate statement according to the principle of superposition is the statement (D).

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