Fossil dating

In addition to being tilted horizontally, the layers have been faulted (dashed lines on figure).Applying the principle of cross-cutting relationships, this fault that offsets the layers of rock must have occurred after the strata were deposited.The principle states that any geologic features that cut across strata must have formed after the rocks they cut through (Figures 2 and 3).

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

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