Difference between relative dating and radioactive dating

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.Some of the scientists' favorite index fossils are trilobites, ammonites and scallop shells.

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Therefore, we can use the succession of fossil assemblages to establish the relative ages of rocks.Let's say in the first outcrop, he found an upper rock layer containing ammonite fossils and a lower layer containing scallops.In the second outcrop, miles and miles away, he also found two layers; but these layers were different.We talked about relative dating of rocks and how scientists use stratigraphic succession to compare the ages of different rock layers.