The Discovery of some fossils or remnants is not the end of the process of their study. One of the main issues of this process is the determination of their age, as it is a very important thing to do. There are a great number of different methods to determine the precise age of fossils. Such a great variety can be easily explained by the fact that the right determination is very important. For example, to create a distinct image of human evolution it is important to know exactly which era certain fossils belong to, as this knowledge determines the order in which human beings obtain new traits.