Radiometric dating of fossils america
Some isotopes have half lives longer than the present age of the universe, but they are still subject to the same laws of quantum physics and will eventually decay, even if doing so at a time when all remaining atoms in the universe are separated by astronomical distances.
Various elements are used for dating different time periods; ones with relatively short half-lives like carbon-14 (or C) are useful for dating once-living objects (since they include atmospheric carbon from when they were alive) from about ten to fifty thousand years old. Longer-lived isotopes provide dating information for much older times.
The key is to measure an isotope that has had time to decay a measurable amount, but not so much as to only leave a trace remaining.
Given isotopes are useful for dating over a range from a fraction of their half life to about four or five times their half life.
It’s like making sure that an hourglass clock was set with all the sand in the top bowl at the beginning.
A series of large inland lakes extended across the region, and it is in the bottoms of these lakes that various plants and animals were buried and fossilized.Revisiting the finds, Holen and his team used a type of radiometric dating that relies on gauging the ratio of uranium to thorium in calcium carbonate material.The method is particularly accurate up to 500,000 years.Contrary to Scripture, many geologists claim that radiometric “clocks” show rocks to be millions of years old.However, to read any clock accurately we must know where the clock was set at the beginning.