How are fossils dated using radiometric dating

Posted by / 19-Apr-2020 02:57

The problem with all radiometric “clocks” is that their accuracy critically depends on several starting assumptions that are largely unknowable.To date a specimen by radiometric means, one must first know the starting amount of the parent isotope at the beginning of the specimen’s existence.And fourth, one must be certain that the decay rate of parent isotope to daughter isotope has always been the same.That one or more of these assumptions are often invalid is obvious from the published radiometric “dates” (to say nothing of unpublished dates) found in the literature.Lava flows from volcanoes on the north rim of the Grand Canyon (which erupted after its formation) show potassium-argon dates a billion years “older” than the most ancient basement rocks at the bottom of the canyon.

Since fossils are rarely found in igneous rocks, one can only date lava flows that are occasionally found between layers of sedimentary rock.The most commonly used radiometric methods for “dating” geological specimens are potassium-argon, uranium-thorium-lead, and strontium-rubidium.All three of these decay processes have half-lives measured in billions of years.None of these methods can be used directly on fossils or the sedimentary rock in which fossils are found.All radiometric dating (with the exception of carbon dating) must be done on igneous rocks (rocks solidified from a molten state such as lava).

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Much of the controversy between evolutionists and creationists concerns the age of the earth and its fossils.

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