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Answered by The Community. Making the world better, one answer at a time. 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.nswered by The Community. Making the world better, one answer at a time. Cross cutting relations are used in relative dating because you can see which layers were deposited before or after the fault occured.
In relative dating, we want to establish a sequence of events for a given area, as seen in cross-. section. These events may include: - Deposition: sediments get deposited from the top and are lithified. - Erosion: a portion of the rock bed is removed by wind or water.