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Science 10 July 1992:
Vol. 257. no. 5067, pp. 232 - 235
DOI: 10.1126/science.1631544
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Articles

Science, Vol 257, Issue 5067, 232-235
Copyright © 1992 by American Association for the Advancement of Science

articles

Megascopic eukaryotic algae from the 2.1-billion-year-old negaunee iron-formation, Michigan

TM Han and B Runnegar

Research Laboratory, Cliffs Mining Services Company-Michigan, Ishpeming 49849.

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


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