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But, the decay elements need to be set, much like you would re-set a stop watch for a runner, to ensure an accurate measurement.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.Absolute dating is necessary for knowing specific time e.g.by isotope K/Ar in mica, especially in the crystalline rock: igneous and metamorphic rock.For dating older materials, scientists use isotopes of other elements, some of which have a half-life of 106 billion years.According to the Utah Geological Survey, nuclear decay of radioactive elements works like a clock in allowing scientists to determine an absolute age.The half-life of a radioactive element is the time required for half the isotope to decay to form the stable daughter isotope.

You can then infer that the dino must have lived some time between these two age dates.

Recent advances in the field of geochronology have led to a greater understanding of the scale and duration of geological processes.

It is currently possible to date igneous and metamorphic rocks by a variety of radiometric methods to within a million years, but establishing the depositional age of sedimentary rocks has remained exceedingly difficult.

If an igneous or other rock is metamorphosed, its radiometric clock is reset, and potassium-argon measurements can be used to tell the number of years that has passed since metamorphism.

Carbon-14 is a method used for young (less than 50,000 year old) sedimentary rocks.




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