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Fossil dating methods

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Since animal species change over time, the fauna can be arranged from younger to older. Thermo-luminescence , Optically stimulated luminescence , and Electron spin resonance.
Researchers who work with prehistoric tools made from flint — a hardened form of quartz — often use thermoluminescence TL to tell them not the age of the rock, but of the tool. In this way, sites that do not have radioactive or other materials for dating can be given a reliable age estimate. Archaeologists also frequently use TL to date ceramics, which are also exposed to high temperatures during manufacture. Measuring carbon in bones or a piece of wood provides an accurate date, but only within a limited range. As potassium decays, it turns into argon.

Everything Worth Knowing About ... Scientific Dating Methods

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Whenever possible, researchers use one or more absolute dating methods, which provide an age for the actual fossil or artifact. By Gemma Tarlach Wednesday, June 01, Afterward, the amount of the radioactive isotope carbon in their remains decreases.
Since animal species change over time, the fauna can be arranged from younger to older. A submethod within biostratigraphy is faunal association: Paleontologists still commonly use biostratigraphy to date fossils, often in combination with paleomagnetism and tephrochronology. Think of it as ordering rather than dating. Measuring carbon in bones or a piece of wood provides an accurate date, but only within a limited range. Archaeologists also frequently use TL to date ceramics, which are also exposed to high temperatures during manufacture.
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