The second method is called absolute dating and is done by analysing the amount of radioactive decay in the minerals of the rocks.
Scientists find out the age of a dinosaur fossil by dating not only the rocks in which it lies, but those below and above it.
Index fossils are fossils that are known to only occur within a very specific age range.
This dating method is also known as Archaeological Dating or Historical Chronology. These methods were relied on especially prior to the introduction of scientific methods of dating.
The majority of the time fossils are dated using relative dating techniques.
Using relative dating the fossil is compared to something for which an age is already known.
The earliest-known hominids in East Africa are often found in very specific stratigraphic contexts that have implications for their relative dating.
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Geologists call this the principle of lateral continuity.
Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.
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