Megascopic Eukaryotic Algae from the 2.1-Billion-Year-Old Negaunee Iron-Formation, Michigan

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<jats:p> Hundreds of specimens of spirally coiled, megascopic, carbonaceous fossils resembling <jats:italic>Grypania spiralis</jats:italic> (Walcott), have been found in the 2.1-billion-year-old Negaunee Iron-Formation at the Empire Mine, near Marquette, Michigan. This occurrence of <jats:italic>Grypania</jats:italic> is 700 million to 1000 million years older than fossils from previously known sites in Montana, China, and India. As <jats:italic>Grypania</jats:italic> appears to have been a photosynthetic alga, this discovery places the origin of organelle-bearing eukaryotic cells prior to 2.1 billion years ago. </jats:p>

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  • Science

    Science 257 (5067), 232-235, 1992-07-10

    American Association for the Advancement of Science (AAAS)

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