Iadviga Zhelezinskaia et al.
Science (New York, N.Y.), 346(6210), 742-744 (2014-11-08)
The minor extent of sulfur isotope fractionation preserved in many Neoarchean sedimentary successions suggests that sulfate-reducing microorganisms played an insignificant role in ancient marine environments, despite evidence that these organisms evolved much earlier. We present bulk, microdrilled, and ion probe