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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.

Biostratigraphy: One of the first and most basic scientific dating methods is also one of the easiest to understand.

The good dates are confirmed using at least two different methods, ideally involving multiple independent labs for each method to cross-check results.

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.

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

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After the recrystallization of magma, more Ca being the most abundant isotope.But it can escape into the surrounding region when the right conditions are met, such as change in pressure and/or temperature.Ar atoms are able to diffuse through and escape from molten magma because most crystals have melted and the atoms are no longer trapped.Although it finds the most utility in geological applications, it plays an important role in archaeology.One archeological application has been in bracketing the age of archeological deposits at Olduvai Gorge by dating lava flows above and below the deposits.

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He has allowed for great genealogical gaps in order to accommodate scientific information which he believes indicates a very old earth (1890: 286).