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One way that helps scientists place fossils into the correct era on the Geologic Time Scale is by using radiometric dating.

Also called absolute dating, scientists use the decay of radioactive elements within the fossils or the rocks around the fossils to determine the age of the organism that was preserved.

Other methods scientists use include counting rock layers and tree rings.

This technique is not restricted to bones; it can also be used on cloth, wood and plant fibers.

Carbon-14 dating has been used successfully on the Dead Sea Scrolls, Minoan ruins and tombs of the pharaohs among other things. The half-life of carbon-14 is approximately 5,730 years. dinosaurs the evolution alleges lived millions of years ago.

The half-lives of several radioactive isotopes are known and are used often to figure out the age of newly found fossils.

Different isotopes have different half-lives and sometimes more than one present isotope can be used to get an even more specific age of a fossil.

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The best radioactive element to use to date human fossils is Carbon-14.

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