John W. Valley

The Apex Chert is a flint-like rock from Western Australia, which contains some of the oldest known fossils. The microscopic fossils are single-celled [[bacteria John Williams Valley (born February 28, 1948, in Winchester, Massachusetts) is an American geochemist and petrologist. He is an expert on stable isotope geochemistry, especially as applied to understanding the evolution of the Earth's crust. Provided by Wikipedia

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