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You can then infer that the dino must have lived some time between these two age dates.
The most widely known form of radiometric dating is carbon-14 dating.
When minerals get subducted into the Earth and come back as volcanic magmas or ash, this essential re-sets the radiometric clock back to zero and therefore a reliable age date is possible.
Geological specimens that are unearthed need to be assigned an appropriate age.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.Since the moon and the Earth probably formed at the same time, this supports the current idea of the Earth's age.You can learn more about fossils, dinosaurs, radiometric dating and related topics by reading through the links below.