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    Techniques used to establish relative dating

    Paleontologists still commonly use biostratigraphy to date fossils, often in combination with paleomagnetism and tephrochronology.

    The textbooks speak of the radiometric dating techniques, and the dates themselves, as factual information.But really, how do scientists figure out how old their dinosaur bones are?And, what about other findings like fossil fish, plants and insects?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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