Organic-rich Shale Samples (IMAGE)

University of California - Riverside

Organic-rich Shale Samples

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Organic-rich shale samples, such as these from the 2.5-billion-year-old Mount McRae Shale from Western Australia, were analyzed for their zinc contents. The results confirm that the early ocean was not Zn-lean and that other controls must be invoked to explain the protracted appearance and proliferation of eukaryotic life.

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Arizona State University

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