What is stratigraphy dating

Consequently, some other point of comparison is needed, some attribute that spreads more even more widely than the particular color and composition of a particular seam of rock.To serve this need, stratigraphers turned to biostratigraphy.This supplements the sequence of rocks with the sequence of fossils.

A subdiscipline of stratigraphy devoted to studying the relative ages of rocks..Remember that sediment is usually spread around a broad area.Individual exposures are usually broken into hundreds of individual layers, each of which will have a slightly different color or texture.In some cases, things get scrambled and even reversed, but geologists learned to diagnose these aberrant cases early on, as these processes leave obvious clues.That works for one cliff face, but how do we compare different exposures?

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