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Before more precise absolute dating tools were possible, researchers used a variety of comparative approaches called relative dating.

These methods — some of which are still used today — provide only an approximate spot within a previously established sequence: Think of it as ordering rather than dating.

Geologists establish the age of rocks in two ways: numerical dating and relative dating.

Numerical dating determines the actual ages of rocks through the study of radioactive decay.

Most scientists and many Christians believe that the radiometric dating methods prove that the earth is 4.5 billion years old.

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Free 5-day trial Discover how geologists study the layers in sedimentary rock to establish relative age.

Learn how inclusions and unconformities can tell us stories about the geologic past.

Sometimes only one method is possible, reducing the confidence researchers have in the results. “They’re based on ‘it’s that old because I say so,’ a popular approach by some of my older colleagues,” says Shea, laughing, “though I find I like it myself as I get more gray hair.” Kidding aside, dating a find is crucial for understanding its significance and relation to other fossils or artifacts.

Methods fall into one of two categories: relative or absolute.

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No details have been confirmed for the first broadcast details, but producer Jane Tranter has said that she plans for pre-production on the series to start in Wales in autumn 2016. It is expected that the series will pump £100 million into the Welsh economy, depending on where it is filmed.