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The principle of superposition states that in an undisturbed sequence of rock layers, the youngest layer is on top and the oldest layer is at the bottom. The principle of original horizontality states that sedimentary rocks are originally deposited in horizontal layers. The principle of lateral continuity states that rock layers extend continuously in all directions until they thin out or reach a barrier. The principle of cross-cutting relationships states that any geological feature that cuts across a rock layer is younger than the layer it cuts through.

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Q: What are the stratigraphic principles?
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