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Second, it is possible to determine the numerical age for fossils or earth materials.

Numerical ages estimate the date of a geological event and can sometimes reveal quite precisely when a fossil species existed in time.

Just as when they were deposited, the strata are mostly horizontal (principle of original horizontality).Sometimes sedimentary rocks are disturbed by events, such as fault movements, that cut across layers after the rocks were deposited.This is the principle of cross-cutting relationships.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.As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.

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