Stratigraphic column dating dating viloence

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Presumably if all the world’s outcrops were integrated, sediments representing all of geologic time would be available for examination.

This optimistic hope, however, must be tempered by the realization that much of the Precambrian record—older than 541 million years—is missing.

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The most useful indication of time equivalence is similar fossil content, provided of course that such remains are present.Following Smith’s pioneering work, generations of geologists have confirmed that similar and even more extensive fossil sequences exist elsewhere.To this day, fossils are useful as correlation tools to geologists specializing in stratigraphy.Furthermore, useful fossils are either rare or totally absent in rocks from Precambrian time, which constitutes more than 87 percent of Earth history.Precambrian rocks must therefore be correlated by means of precise isotopic dating.faunal succession is a secondary principle.

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