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In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.

In a separate article (Radiometric dating), we sketched in some technical detail how these dates are calculated using radiometric dating techniques.

The method relies on satisfying some important assumptions: Given careful work in the field and in the lab, these assumptions can be met.

The rock sample to be dated must be chosen very carefully.

Most of the things that upset K-Ar dating, like slow escape of Ar atoms, weathering, or heating, make ages too young by resetting the clock.

Developed in the 1950s, it was important in developing the theory of plate tectonics and in calibrating the geologic time scale.

Potassium occurs in two stable isotopes (Ar atoms trapped inside minerals.

Argon was discovered in 1894 by English chemist John William Strutt, most commonly known as Lord Rayleigh (1842-1919), and Scottish chemist William Ramsay (1852-1916).

It was the first of the noble gases to be isolated.

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