The Principle of Cross Cutting Relationship
That depends! If the fault line cross cuts the igneous intrusion causing the intrusion to be displaced on either side of the fault and forming a broken mass of rock within the intrusion known as a fault breccia then the fault is younger than the intrusions, as the intrusion must have already existed for the fault to cause it's displacement. If on the other hand the igneous intrusion cross cuts the fault and is un-deformed then it is probable that it is younger than the fault.
How could the rock be faulted if it came after the faulting? It wouldn't be there to fault. So therefore, what ever the fault cuts through, it must be younger than it in order for it to be able to cut the rock in the first place.
Magma that forces its way into rocks and hardens is called intrusion.
older because it is at the bottom and the ones on top are younger than the bottoms
100 year old
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.
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.
That depends! If the fault line cross cuts the igneous intrusion causing the intrusion to be displaced on either side of the fault and forming a broken mass of rock within the intrusion known as a fault breccia then the fault is younger than the intrusions, as the intrusion must have already existed for the fault to cause it's displacement. If on the other hand the igneous intrusion cross cuts the fault and is un-deformed then it is probable that it is younger than the fault.
One is not necessarily older than the other. It depends on the context. A fault running through any rock must be younger than that rock.
A fault is necessarily younger than faults it cuts through; it could not have happened if the layers were not there first.
Cross cutting relations are used in relative dating because you can see which layers were deposited before or after the fault occured. The same way, when a fault cuts through a rock, or when magma intrudes and crystallizes, we can assume that the fault or intrusion is younger than the rocks affected.
How could the rock be faulted if it came after the faulting? It wouldn't be there to fault. So therefore, what ever the fault cuts through, it must be younger than it in order for it to be able to cut the rock in the first place.
Yes
Magma that forces its way into rocks and hardens is called intrusion.
A fault must be younger than the rock it cuts through.
The rock layers that a fault passes through had to have already existed for them to break and create a fault. This is analogous to the door panel of your car had to have already existed for it to bend and create a dent.
Prior relationship related answer: Don't be cross cutting across other peoples relationships because you will find your self stuck in the middle. Geological answer: The law of cross cutting relationships states that an igneous intrusion or fault that cuts across another rock stratum must be younger than said stratum.