What is potassium argon dating
The oldest known rocks on the earth that have been analyzed, have been dated back some 4.404 billion years.
Carbon dating actually contributes very little to the available evidence for evolutionary theory.
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Carbon dating is radiometric dating, using the carbon 14 isotope.
Carbon 14 is used for fossils of fairly recent origin, as it becomes less and less accurate beyond 10 half lives (about 50 thousand years). Longer lived isotopes such as uranium/uranium, uranium/thorium, and potassium/argon are used to date inorganic materials of volcanic origin, such as rock or layers of volcanic ash, and can yield results ranging from millions to billions of years, accurate to within about a hundred thousand years.
Thus, the ratio of argon and potassium and radiogenic calcium to potassium in a mineral or rock is a measure of the age of the sample. Potassium is a common element found in many materials, what does potassium argon dating means, such as micasclay mineralstephraand evaporites.
Radiometric dating (often called radioactive dating) is a technique used to date materials, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.