In other words, the nuclei do not "wear out" or get "tired". In other words, during million years, half the U atoms that existed at the beginning of that time will decay to Pb This is known as the half life of U- Many elements have some isotopes that are unstable, essentially because they have too many neutrons to be balanced by the number of protons in the nucleus.
The Triceratops dinosaur fossils are approximately 70 million years old, because they are found in shale and siltstone that contain volcanic ash radiometrically dated at 70 million years. The age of the Triceratops can be determined more closely than that of the acritarchs and bacteria and that of the trilobites because the rock unit that contains the Triceratops can itself be radiometrically dated, whereas that of the other fossils could not.
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The word 'fossil' literally means anything dug out of the earth. Fossils are actually calculate the relative age of rock beds as well as helps in dating other fossils. The word fossil comes from the Latin word fossus, meaning "having been dug up." Fossils are often found in rock formations deep in the earth. For many people the word “fossil” probably conjures an image of a bit of hardened bone or shell, but fossils can take many forms. Dating Layers of the Earth.