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.Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.
By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change.
For a determination in the field, geologists attempt to date a rock or fossil based on its relative age, which is usually determined by the presence of a trace fossil, or the position of the rock layer in relation to a layer of rock with a known age.
A trace fossil is the remains of a rapidly evolving organism that was widespread geographically, and is known to have existed only during a specific geologic time period.
Dating is a technique used in archeology to ascertain the age of artifacts, fossils and other items considered to be valuable by archeologists.
There are many methods employed by these scientists, interested in the old, to get to know the age of items.