Our planet inherits a large number of artifacts and monuments bestowed upon us by older historic civilizations.These remains are subjected to dating techniques in order to predict their ages and trace their history.Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter.Each isotope is identified with what is called a ‘mass number’.
They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.
To find their age, two major geological dating methods are used.
These are called relative and absolute dating techniques.
For example, fission track dating measures the microscopic marks left in crystals by subatomic particles from decaying isotopes.
Another example is luminescence dating, which measures the energy from radioactive decay that is trapped inside nearby crystals.
Stratigraphy: The oldest dating method which studies the successive placement of layers.