Tilton and Patterson, US geochemists

Tilton and Patterson, US geochemists

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Tilton and Patterson. US geochemists George R. Tilton (1923-2010, left) and Clair Cameron Patterson (1922-1995, right). Tilton and Patterson specialized in uranium-lead geochronology, working together on ancient rocks and meteorites to obtain the first accurate values for the age of the Earth and the solar system. This work was carried out from the late 1940s, with the Earth's age of 4.55 billion years announced in 1953. Photographed at the Tyler Awards ceremony in 1995. Patterson was awarded that year's Tyler Prize for Environmental Achievement for his work on the risks of lead poisoning. He received a gold medal and 150,000 US dollars.

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