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The number of tracks increases over time at a rate that depends on the uranium content.It is possible to calculate the age of a sample by measuring the uranium content and the density of the fission tracks.Sedimentary rocks are rarely useful for dating because they are made up of bits of older rocks.
The oldest rocks and fossils are at the bottom and the youngest are on top.
The level of nitrogen gradually reduces as the bone decays.
Absolute dating is not possible with this method because the rate at which the nitrogen content declines depends on the surrounding temperature, moisture, soil chemicals and bacteria.
This damage is in the form of tiny marks called fission tracks.
When volcanic rocks and minerals are formed, they do not contain fission tracks.
Knowing when a dinosaur or other animal lived is important because it helps us place them on the evolutionary family tree.