Relative age dating geology
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Principle of cross-cutting relations: The principle is another example of which came first.
Instead of using layers, it involves features that cut through the rock, like a fault or a dike.
In this example above, we have rock layers A - E and Fault F showing.
According to superposition, A is the oldest rock layer, while E is the youngest rock layer. According to cross-cutting relations, the fault is younger than those layers it cuts.
However, it does not cut layers D and E, so those layers are younger than Fault F.