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Science 3 July 1987:
Vol. 237. no. 4810, pp. 70 - 73
DOI: 10.1126/science.11539686
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Articles

Science, Vol 237, Issue 4810, 70-73
Copyright © 1987 by American Association for the Advancement of Science

articles

Early Archean (3.3-billion to 3.5-billion-year-old) microfossils from Warrawoona Group, Australia

JW Schopf and BM Packer

Department of Earth and Space Sciences, University of California, Los Angeles 90024, USA.

Cellularly preserved filamentous and colonial fossil microorganisms have been discovered in bedded carbonaceous cherts from the Early Archean Apex Basalt and Towers Formation of northwestern Western Australia. The cell types detected suggest that cyanobacteria, and therefore oxygen-producing photosynthesis, may have been extant as early as 3.3 billion to 3.5 billion years ago. These fossils are among the oldest now known from the geologic record; their discovery substantiates previous reports of Early Archean microfossils in Warrawoona Group strata.


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