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The site also must be geologically meaningful, clearly related to fossil-bearing rocks or other features that need a good date to join the big story.

Lava flows that lie above and below rock beds with ancient human fossils are a good—and true—example.

This tree ring record has proven extremely useful in creating a record of climate change, and in finding the age of ancient structures. The thick, light-colored part of each ring represents rapid spring and summer growth.Furthermore, the stepwise leaching technique has the advantage over multi-phase Pb Pb dating in that it does not require initial Pb isotope equilibrium among the phases, but may be used to test it.The presence of microscopic solid inclusions, which complicate dating of single phases if they are not in equilibrium with the host, can be traced via the behaviour of the Pb ratio through the various leaching steps.The thin, dark part of each ring represents slow autumn and winter growth.Several other processes result in the accumulation of distinct yearly layers that can be used for dating.

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The potassium-argon (K-Ar) isotopic dating method is especially useful for determining the age of lavas.

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