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Potassium-argon dating , method of determining the time of origin of rocks by measuring the relation of radioactive argon to radioactive potassium in the rock. That dating method is based leading the decay of radioactive potassium to radioactive argon in minerals and rocks; potassium also decays to calcium Thus, the proportion of argon and potassium as well as radiogenic calcium to potassium popular a mineral or rock is a measure of the grow older of the sample.
The calcium-potassium age method is seldom hardened, however, because of the important abundance of nonradiogenic calcium inside minerals or rocks, which masks the presence of radiogenic calcium. On the other hand, the abundance of argon in the Earth is relatively small considering of its escape to the atmosphere during processes associated through volcanism.
The potassium-argon dating means has been used to quota a wide variety of ages. The potassium-argon age of roughly meteorites is as old have the status of 4,,, years, and volcanic rocks as young as 20, years old have been measured sooner than this method. We welcome suggested improvements to any of our articles.
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This diagram shows a selection of rock layers, or stratigraphic columns, from the Koobi Fora geologic formation on the eastern shore of Lake Turkana in Kenya. This area is a ridge of sedimentary rock where researchers have found more than 10, fossils, both human and other hominins, since These fossils aid the scientific investigation of human evolution.
The Age of Dinosaurs was so many millions of years ago that it is very difficult to date exactly. Scientists use two kinds of dating techniques to work out the age of rocks and fossils. The first method is called relative dating.