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According to the law of crosscutting relationships, any geological feature that cuts across another must be younger than the feature it disrupts. In this case, if a fault ends at an unconformity, it indicates that the fault must be older than the unconformity because the unconformity represents a period of erosion or non-deposition that occurred after the faulting. Thus, the relative ages can be determined, with the fault being older than the unconformity and the rock layers below the unconformity being older than the fault itself.

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How are the laws of superposition and crosscutting relationship used to determine the relative age of rocks?

They are used to determine the relative ages of rocks by stating that younger rocks lie above older rocks, and that rocks that cut through a layer are younger than the existing layer.


Does the law of crosscutting relationships involve sedimentary rock only?

No, the law of crosscutting relationships can apply to any type of rock. It states that a geological feature must be younger than the rock it cuts across. This principle helps geologists determine the relative ages of rocks and geological events.


What is the relative age of a fault or igneous intrusion that cuts through an unconformity?

The relative age of a fault or igneous intrusion that cuts through an unconformity is younger than the unconformity but older than the rock it cuts through. This is because the fault or intrusion must have formed after the deposition of the rock layers below the unconformity but before the deposition of the rock layers above the unconformity.


What is the relative age of fault or igneous intrusion that cuts through an unconformity?

If a fault or intrusion cuts through an unconformity, the fault or intrusion is younger than all the rocks it cuts through above and below the unconformity.


How are the laws of superposition and crosscutting relationships used to determine the age of rocks?

They are used to determine the relative ages of rocks by stating that younger rocks lie above older rocks, and that rocks that cut through a layer are younger than the existing layer.


How do you determine the relative age relationship of faults to the rocks they cut?

Relatively, they are younger than the rock they cut through.


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