How are the principles of lateral continuity and superposition related?

Question

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Both principles are fundamental to the determination of relative ages in geology. Lateral continuity states that layers of sedimentary rock extend horizontally in all directions until they thin out or encounter an obstacle, while superposition states that in undisturbed layers of rock, the oldest rocks are at the bottom and the youngest rocks are at the top. The two principles together allow geologists to extend relative age relationships over larger areas.

How Are the Principles of Lateral Continuity and Superposition Related