Figure 2: Relative dating puts geologic events in chronological order without requiring that a specific numerical age be assigned to each event. For example, unstable 14 C transforms to stable nitrogen 14 N. For example, the element carbon has six protons, but can have six, seven, or eight neutrons. This field is known as thermochronology or thermochronometry. In the example, 14 C is the parent and 14 N is the daughter.
The position of the lower arrowhead indicates the first occurrence of the fossil and the upper arrowhead indicates its last occurrence — when it went extinct.
The atomic nucleus that undergoes radioactive decay polarity magnetic polarity: However, the age of each fossil primate needs to be determined so that fossils of the same age found in different parts of the world and fossils of different ages can be compared. For example, if the measured abundance of 14 C and 14 N in a bone are equal, one half-life has passed and the bone is 5, years old an amount equal to the half-life of 14 C. After one half-life has elapsed, one half of the atoms of the nuclide in question will have decayed into a "daughter" nuclide or decay product. Because of this, magnetic minerals in rocks are excellent recorders of the orientation, or polarityof the Earth's magnetic field. The different methods of radiometric dating are accurate over different timescales, and they are useful for different materials. The Swedish National Heritage Board.