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The principle states that any geologic features that cut across strata must have formed after the rocks they cut through (Figures 2 and 3).According to the principle of original horizontality, these strata must have been deposited horizontally and then titled vertically after they were deposited.The principle of superposition states that in an undeformed sequence of sedimentary rocks, each layer of rock is older than the one above it and younger than the one below it (Figures 1 and 2).Accordingly, the oldest rocks in a sequence are at the bottom and the youngest rocks are at the top.Most sediment is either laid down horizontally in bodies of water like the oceans, or on land on the margins of streams and rivers.

Thus, any deformations of strata (Figures 2 and 3) must have occurred after the rock was deposited.

The layers of rock at the base of the canyon were deposited first, and are thus older than the layers of rock exposed at the top (principle of superposition).



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