Geologic Principles Part I

Refer to this diagram of a hypothetical geological cross-section.

Which of the lettered features is the oldest?

• Layer W

• Layer Y

• Layer Z

• Layer X

Answer explanation

Based on the Principle of Superposition, rock layers on the bottom are older than those found above them.

Refer to this diagram of a hypothetical geological cross-section.

Which rock layer is the youngest?

• Layer Z

• Layer X

• Layer W

• Layer T

Answer explanation

Based on the Principle of Superposition, each rock layer is younger than the one below it.

Refer to this diagram of a hypothetical geological cross-section.

Which is older, T or W?

• None. Both layers are of the same age.

• Layer Y

• Layer T

• Layer W

Refer to this diagram of a hypothetical geological cross-section.

Which immediately occurred succeeding V?

• Layer T

• Layer X

• Layer Y

• Layer W

Refer to this diagram of a hypothetical geological cross-section.

Which is younger, T or V?

• Layer W

• Layer T

• Layer V

• None of the above.

Refer to this diagram of a hypothetical geological cross-section.

What is the proper sequence of the lettered features, from oldest to youngest (5 points)?

(Example: ABCDE)