If Ps overlies Pi, which is older?

Study for the ASBOG Fundamentals of Geology exam. Access flashcards, multiple-choice questions, and understand key geologic principles. Prepare confidently for your exam!

Multiple Choice

If Ps overlies Pi, which is older?

Explanation:
The key idea is the law of superposition. In an undisturbed sequence of rocks, the oldest material is at the bottom and younger layers accumulate on top. If Ps sits on top of Pi, Ps is the newer layer, and Pi lies below it, so Pi is older. This assumes there hasn’t been disturbance like folding or faulting that could flip the relationship.

The key idea is the law of superposition. In an undisturbed sequence of rocks, the oldest material is at the bottom and younger layers accumulate on top. If Ps sits on top of Pi, Ps is the newer layer, and Pi lies below it, so Pi is older. This assumes there hasn’t been disturbance like folding or faulting that could flip the relationship.

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