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will change the isotopic makeup of terrestrial lead. Patterson, Tilton and
Inghram assumed that iron meteorites, which contain lead but virtually no uranium, formed at the same time as the Earth. Assuming this to be true, the isotopic makeup of lead in iron meteorites should still be the same as
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that of the newly formed Earth, so the Earth can be dated by comparing the composition of lead in iron meteorites with that in new volcanic material on the Earth. Patterson, Tilton and
Inghram did this and found that the Earth was approximately 4.5 billion years old.
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as an instructor in 1947 and remained there until his retirement in 1985. He died at his home in
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Concentration of
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First use of meteorites to find the age of the Earth
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