Bertram Boltwood (1870-1927) proposes that the amount of lead in uranium and thorium ores might be used to determine the Earth's age and crudely dates some rocks to have ages between 410--2200 million years
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Citation: Editors, Litencyc. "Determination of Earth’s age". The Literary Encyclopedia. First published 01 May 2009 [https://staging.litencyc.com/php/stopics.php?rec=true&UID=6413, accessed 23 November 2024.]