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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.
Cross-cutting relationships may be compound in nature. For example, if a fault were truncated by an unconformity, and that unconformity cut by a dike. Based upon such compound cross-cutting relationships it can be seen that the fault is older than the unconformity which in turn is older than the dike.ross-cutting relationships may be seen cartographically, megascopically, and microscopically. In other words, these relationships have various scales. A cartographic crosscutting relationship might look like, for example, a large fault dissecting the landscape on a large map.