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Radiometric dating isn't the only method of determining the age of rocks.
Other techniques include analyzing amino acids and measuring changes in an object's magnetic field.
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For example, by using a laser, researchers can measure parent and daughter atoms in extremely small amounts of matter, making it possible to determine the age of very small samples [source: New Scientist].
Find additional lessons, activities, videos, and articles that focus on relative and absolute dating.
The most widely known form of radiometric dating is carbon-14 dating.
Fossils, however, form in sedimentary rock -- sediment quickly covers a dinosaur's body, and the sediment and the bones gradually turn into rock.
But this sediment doesn't typically include the necessary isotopes in measurable amounts.