Relative age dating of rocks
The same margin of error applies for younger fossiliferous rocks, making absolute dating comparable in precision to that attained using fossils.To achieve this precision, geochronologists have had to develop the ability to isolate certain high-quality minerals that can be shown to have remained closed to migration of the radioactive parent atoms they contain and the daughter atoms formed by radioactive decay over billions of years of geologic time.Similarly, in geologic studies, vast quantities of information from widely spaced outcrops have to be integrated.Some method of correlating rock units must be found.
Unlike ages derived from fossils, which occur only in sedimentary rocks, absolute ages are obtained from minerals that grow as liquid rock bodies cool at or below the surface.
It is only by correlations that the conditions on different parts of Earth at any particular stage in its history can be deduced.
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