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Relative age dating geology
Almost without exception, the relative order of strata defined by fossils has been confirmed by radiometric ages.
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Nevertheless, there is no greater testimony to the validity of fossil-based stratigraphic geology than the absolute dates made possible through radioactive measurements.Finally, the measurement of a host of rock properties may well be the ultimate key to correlation of separated outcrops.The more ways in which two rocks are physically alike, the more likely it is that the two formed at the same time.On the practical side, an index fossil should be distinctive in appearance so as to prevent misidentification, and it should be cosmopolitan both as to geography and as to rock type.In addition, its fossilized population should be sufficiently abundant for discovery to be highly probable.Precambrian rocks must therefore be correlated by means of precise isotopic dating.Unlike the principles of superposition and crosscutting, faunal succession is a secondary principle.When information derived from two outcrops is integrated, the time interval they represent is probably greater than that of each alone.Presumably if all the world’s outcrops were integrated, sediments representing all of geologic time would be available for examination.This requires that the lifespan of the fossil species be but a moment of time relative to the immensity of geologic history.In other words, the fossil species must have had a short temporal range.