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If you look at a series of fossils, say shells or mammal bones, you may be able to see the development of structures that give an indication of which fossils are older.In all these instances, you may be able to tell the relative ages of the items being examined, but you will not necessarily know the actual ages (101 years, 10000 years, 100 million years) or the amount of time between an older and a younger specimen.

Photo from Glen Canyon National Recreation Area, Utah.Though using similar methods, these two techniques differ in certain ways that will be discussed in this article.As the name implies, relative dating can tell which of the two artifacts is older.It is possible to tell the number of years ago a particular rock or archeological site had been formed.Two broad categories of classification methods are relative dating and absolute dating.

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