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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.
law of cross-cutting relationships An igneous rock, fault, or other geologic feature must be younger than any rock across which it cuts. Cite this article. Pick a style below, and copy the text for your bibliography. MLA. Chicago. APA. AILSA ALLABY and MICHAEL ALLABY.  law of cross-cutting relationships. . . 1999.