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"Libby's method remained the only way to measure carbon-14 in samples for several decades and was long considered the most accurate means of dating by carbon decay," said David Mazziotti, a UChicago chemistry professor who submitted the formal nomination of the site as a historic chemical landmark to the American Chemical Society.The work earned Libby the 1960 Nobel Prize in chemistry "for determinations in archaeology, geology, geophysics and other branches of science." The technique, which measures materials' content of carbon-14, quickly made an impact on archaeology and geology.Archaeologists testing the ages of artifacts from multiple sites across the Eastern and Western hemispheres found that civilization originated simultaneously around the world rather than in Europe.The oldest fossils of the familiar pine tree that dominates Northern Hemisphere forests today has been found by researchers.The 140-million-year-old fossils (dating from the Cretaceous ‘Age of the ...