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The tilted rocks at the bottom are part of the Proterozoic Grand Canyon Group (aged 825 to 1,250 Ma).

The flat-lying rocks at the top are Paleozoic (540 to 250 Ma).

The simplest and most intuitive way of dating geological features is to look at the relationships between them.

There are a few simple rules for doing this, some of which we’ve already looked at in Chapter 6.

[SE] The principle of cross-cutting relationships states that any geological feature that cuts across, or disrupts another feature must be younger than the feature that is disrupted.

An example of this is given in Figure 8.7, which shows three different sedimentary layers.

The term refers to the fact that an approximate date can be inferred by comparison with something else of known age.

Recognizing unconformities is important for understanding time relationships in sedimentary sequences.

An example of an unconformity is shown in Figure 8.8.

In archaeological terminology, there are two categories of dating methods: absolute and relative.

Absolute dating utilizes one or more of a variety of chronometric techniques to produce a computed numerical age, typically with a standard error.

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