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Patterson publishes an isochron age for the solar system and therefore the Earth of 4.
Gerling uses Nier's "primeval" lead isotope ratios to create lead isotopic growth curves, and uses these to estimate a minimum age for the Earth's crust of 3.
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Due to that assumption being incorrect, Holmes mis-interprets scatter around a single growth curve as a number of independent growth curves.
Researchers were unaware that there can be multiple isotopes of the same element, each with a different decay rate.
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