Pretty obvious that the dike came after the rocks it cuts through, right? Sorby was the first to document microscopic melt inclusions in crystals. Included fragments[ edit ] The law of included fragments is a method of relative dating in geology. Uniformitarianism[ edit ] The principle of Uniformitarianism states that the geologic processes observed in operation that modify the Earth's crust at present have worked in much the same way over geologic time. Prior to the discovery of radiometric dating which provided a means of absolute dating in the early 20th century, archaeologists and geologists were largely limited to the use of relative dating techniques to determine the geological events.
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