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- Search Terms:ISSN: 00280836AndISSN: 14764687AndVolume Number: 444AndIssue Number: 7120AndStart Page: 744AndDate: 2006 Revise Search
- 1From: Nature. (Vol. 444, Issue 7120) Peer-ReviewedAuthor(s): D. A. Fike (corresponding author) [1]; J. P. Grotzinger [1, 3]; L. M. Pratt [2]; R. E. Summons [1] Oxygenation of the Earth's surface is increasingly thought to have occurred in two steps. The first step,...