Since the moon and the Earth probably formed at the same time, this supports the current idea of the Earth's age. That is, at some point in time, an atom of such a nuclide will undergo radioactive decay and spontaneously transform into a different nuclide. It is, in essence a form of relative dating. Fossils, however, form in sedimentary rock -- sediment quickly covers a dinosaur's body, and the sediment and the bones gradually turn into rock. Amino acid racemisation Archaeomagnetic dating Dendrochronology Ice core Incremental dating Lichenometry Paleomagnetism Radiometric dating Radiocarbon Uranium—lead Potassium—argon Tephrochronology Luminescence dating Thermoluminescence dating. Meteoritics and Planetary Science.
Upper Miocene - Piocene.
However, the ages resulting from such analyses inform us about the cooling age of the crystal, so can only provide a maximum age for deposition of the sedimentary rock in which they are found. A relatively short-range dating technique is based on the decay of uranium into thorium, a substance with a half-life of about 80, years. Kelvin could not have know that new heat is generated inside the Earth by radioactive decay nuclear fissionbecause the process had not been discovered. Accurate radiometric dating generally requires that the parent has a long enough half-life that it will be present in significant amounts at the time of measurement except as described below under "Dating with short-lived extinct radionuclides"the half-life of the parent is accurately known, and enough of the daughter product is produced to be accurately measured and distinguished from the initial amount of the daughter present in the material. While the moment in time at which a particular nucleus decays is unpredictable, a collection of atoms of a radioactive nuclide decays exponentially at a rate described by a parameter known as the half-lifeusually given in units of years when discussing dating techniques.