Process of relative dating

Process of relative dating

The upper layer had scallop fossils, and the lower layer had trilobites.Smith would have brought these two arrangements together, overlapping the common scallop layer, to produce a larger succession of three rock strata!He began to identify rock layers by the fossils they contained, and he even noticed that the general order of strata was identical over many different parts of the country.Smith was the first person to understand the principle of fossil succession.

So, how exactly is an index fossil used for relative dating of rocks?Now, when we use fossils to date rocks, we have to be careful. Remember that some species of animals and plants lived for a very long time, while others existed only for a short period of time.We don't want to use fossils belonging to species that lived for too long; these fossils would show up in more than one rock layer.He worked in Southern England, and he got to see all kinds of different rock strata that were exposed in outcrops and canals.William Smith collected fossils from his work sites and, over time, he learned to recognize which fossils tended to show up in which rock strata.

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