Consider three undeformed horizontal beds of sedimentary rocks. Which layer is the oldest?

Name: Consider three undeformed horizontal beds of sedimentary rocks. Which layer is the oldest?
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The principle of superposition states that in a sequence of undisturbed sedimentary rocks, the oldest rocks are at the bottom and the youngest rocks are at the top. Therefore, the lower layer is the oldest while the upper layer is the youngest.

Consider Three Undeformed Horizontal Beds of Sedimentary Rocks