![]() ![]() In short an intrusive rock body is younger than the rocks it intrudes. James Hutton’s observations related to uniformitarianism also serve as the basis for another important geologic principle called cross-cutting relationships, which is a technique used in relative age dating. ![]() Black Canyon of the Gunnison National Park, Colorado. The light colored dikes are younger than the dark rock. Pegmatite dikes exposed in Painted Wall cliff face.
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