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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.
These artifacts can be placed in order, but requires external information to determine which end of the series is younger or older. Absolute dating determines the age of artifacts in terms of the number of years before the present, with reference to a fixed time scale. The main approaches to cross dating include annual cycle methods, radioactive clocks, and trapped electron material.