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Accordingly, the oldest rocks in a sequence are at the bottom and the youngest rocks are at the top.Sometimes sedimentary rocks are disturbed by events, such as fault movements, that cut across layers after the rocks were deposited.However, by itself a fossil has little meaning unless it is placed within some context.The age of the fossil must be determined so it can be compared to other fossil species from the same time period.Just as when they were deposited, the strata are mostly horizontal (principle of original horizontality).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).There are three general approaches that allow scientists to date geological materials and answer the question: "How old is this fossil?" First, the relative age of a fossil can be determined.

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A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.

The principle of superposition builds on the principle of original horizontality.

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).

Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.