Other radioactive dating methods

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...igneous activity (both extrusive and intrusive) occurred in the Caledonian mountain belt, which stretched from New England, Nova Scotia, Newfoundland, Scotland, and Scandinavia to eastern Greenland.Radiometric dating of granitic intrusions associated with the Caledonian orogeny yields ages between about 430 million and 380 million years...to the extent of about 100 parts per million (ppm) in tektites—far below the value for terrestrial igneous or sedimentary rocks.Much information about tektite history is obtained by radioisotopic dating; the ages cited above for the tektite strewn-fields were found by potassium-argon dating.His estimate came into question after the discovery of naturally occurring radioactivity by the French physicist Henri Becquerel in 1896 and the subsequent recognition by his colleagues, Marie and Pierre Curie, that compounds of radium (which occur in uranium minerals)...

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Studies of isotopes formed from the decay of radioactive parent elements with short half-lives, in both lunar samples and meteorites, have demonstrated that the formation of the inner planets, including Earth, and the Moon was essentially complete within 50 million years after the interstellar cloud region collapsed.As a result of their longevity, they are still present in meteorites and on Earth, and they are commonly used for dating rocks and meteorites.

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