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Students not only want to know how old a fossil is, but they want to know how that age was determined.

Some very straightforward principles are used to determine the age of fossils.

There are several different methods for estimating the ages of fossils, including: Paleontologists rely on stratigraphy to date fossils.

Stratigraphy is the science of understanding the strata, or layers, that form the sedimentary record.

Different methods have their own limitations, especially with regard to the age range they can measure and the substances they can date.

A common problem with any dating method is that a sample may be contaminated with older or younger material and give a false age.

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.This problem is now reduced by the careful collection of samples, rigorous crosschecking and the use of newer techniques that can date minute samples.Volcanic rocks – such as tuff and basalt – can be used in dating because they are formed at a particular moment in time, during an eruption.If a fossil is found between two layers of rock whose ages are known, the fossil's age is thought to be between those two known ages.Because rock sequences are not continuous, but may be broken up by faults or periods of erosion, it is difficult to match up rock beds that are not directly adjacent.Instead, other methods are used to work out a fossil’s age.